If you love bright citrus desserts with a soft, buttery texture, this High-Protein Diabetic-Friendly Key Lime Greek Yogurt Bundt Cake is a recipe you’ll want to make again and again. It combines the refreshing flavor of fresh key limes with a moist, tender crumb and a beautiful glossy glaze, creating a dessert that looks just as impressive as it tastes. Unlike traditional pound cakes that are loaded with refined sugar and white flour, this healthier version uses nutrient-rich ingredients that deliver satisfying flavor while supporting a balanced lifestyle.

This original recipe replaces refined flour with a carefully balanced blend of almond flour, oat flour, whey protein isolate, and oat fiber to create a rich cake that’s naturally higher in protein and lower in digestible carbohydrates. Creamy Greek yogurt keeps every slice incredibly moist, while fresh key lime zest and juice provide a vibrant citrus flavor that shines through every bite. A sugar-free key lime glaze finishes the cake with a glossy bakery-style appearance that perfectly matches the classic Bundt cake presentation.

Whether you’re baking for a family celebration, preparing a healthier holiday dessert, or simply craving a refreshing homemade cake to enjoy with coffee or tea, this Bundt cake is an excellent choice. It’s elegant enough for entertaining yet easy enough for weekend baking. Best of all, every slice offers a generous protein boost without sacrificing the soft texture and rich flavor that make pound cake such a timeless favorite.

Why You’ll Love This Recipe

• High in protein with approximately 13–15 grams per slice.
• Completely refined sugar-free and diabetic-friendly.
• Moist, buttery pound cake texture.
• Bright fresh key lime flavor.
• Beautiful glossy sugar-free glaze.
• No refined white flour.
• Lower glycemic impact than traditional pound cake.
• Perfect for holidays, brunches, and celebrations.
• Stays moist for several days.
• Easy to prepare with simple wholesome ingredients.
• Freezer-friendly.
• Bakery-quality presentation at home.

Also CheckOut: 30-Day High-Protein Meal Plan for Weight Loss: Easy Recipes, Meal Prep Tips & Complete Nutrition Guide

Equipments

• 10-inch Bundt pan (10 to 12-cup capacity) – Produces the classic tall Bundt cake shape shown in the reference image while ensuring even baking.
• Large mixing bowl (5-quart) – Provides enough room for mixing the cake batter thoroughly.
• Medium mixing bowl (2-quart) – Perfect for combining the dry ingredients separately.
• Electric hand mixer or stand mixer – Helps create a smooth, fluffy batter with excellent volume.
• Microplane zester – Removes only the fragrant green zest from the key limes without the bitter white pith.
• Citrus juicer – Makes extracting fresh key lime juice quick and efficient.
• Silicone spatula – Ideal for gently folding the batter and scraping the mixing bowl clean.
• Cooling rack – Allows the cake to cool evenly while maintaining its delicate crumb.
• Pastry brush (optional) – Helps lightly grease every detail inside the Bundt pan for easy release.
• Measuring cups and measuring spoons – Ensure accurate ingredient measurements for consistent baking.

Ingredients

Key Lime Bundt Cake

• 2 cups finely blanched almond flour
• 1 cup finely milled oat flour
• ½ cup unflavored whey protein isolate
• ¼ cup oat fiber
• 2 tablespoons coconut flour
• 2 teaspoons baking powder

• ½ teaspoon baking soda
• ½ teaspoon fine sea salt
• ¾ cup plain non-fat Greek yogurt
• 4 large eggs, room temperature
• ½ cup powdered monk fruit sweetener with erythritol
• ¼ cup melted unsalted butter

• 2 tablespoons avocado oil
• ¼ cup freshly squeezed key lime juice
• 2 tablespoons finely grated key lime zest
• 2 teaspoons pure vanilla extract
• ½ teaspoon natural key lime extract (optional)

Sugar-Free Key Lime Glaze

• ¾ cup powdered monk fruit sweetener
• 2 tablespoons plain non-fat Greek yogurt
• 2 tablespoons freshly squeezed key lime juice
• 1 teaspoon key lime zest
• 1 tablespoon unsweetened almond milk (if needed)

Optional Garnish

• Freshly grated key lime zest
• Thin slices of fresh key lime
• Finely chopped unsalted pistachios (optional)

Ingredients Notes

• Blanched Almond Flour

Finely blanched almond flour creates a moist, tender crumb while naturally reducing the carbohydrate content compared to traditional white flour. It also contributes healthy fats and vitamin E that complement the citrus flavor beautifully.

• Finely Milled Oat Flour

Oat flour adds softness and structure while supplying additional fiber that helps create a lower glycemic dessert. Its mild flavor blends seamlessly with the almond flour without overpowering the fresh key lime.

• Whey Protein Isolate

Unflavored whey protein isolate significantly boosts the protein content while helping create a satisfying, bakery-style texture. Measuring it accurately prevents the cake from becoming dense.

• Greek Yogurt

Plain non-fat Greek yogurt provides exceptional moisture, richness, and protein while replacing much of the fat found in traditional pound cakes. It also gives the cake a subtle tang that enhances the citrus flavor.

• Fresh Key Limes

Fresh key lime juice and zest provide a bright, aromatic citrus flavor that’s more fragrant and complex than bottled juice. The zest contains natural oils that create the cake’s signature aroma.

• Monk Fruit Sweetener

A powdered monk fruit sweetener blended with erythritol provides balanced sweetness without refined sugar, making the cake suitable for diabetic-friendly baking while maintaining a smooth texture.

• Oat Fiber

Oat fiber improves the structure of the batter while contributing virtually no digestible carbohydrates. It helps balance the moisture from the yogurt and citrus juice.

• Eggs

Room-temperature eggs provide structure, moisture, and additional protein while helping the cake rise evenly and develop a soft, delicate crumb.

• Butter and Avocado Oil

Using both melted butter and avocado oil creates a rich buttery flavor while keeping the cake exceptionally moist for several days after baking.

• Sugar-Free Key Lime Glaze

The simple glaze made with powdered monk fruit sweetener, Greek yogurt, and fresh key lime juice creates the glossy light-green finish seen in the reference image while adding another layer of bright citrus flavor without refined sugar.

How to Make High-Protein Diabetic-Friendly Key Lime Greek Yogurt Bundt Cake

• Preheat your oven to 350°F (175°C). Thoroughly grease a 10-inch Bundt pan with softened butter or baking spray, making sure every groove and curve is coated. Lightly dust the inside with a small amount of almond flour to ensure the cake releases cleanly after baking.
• Remove the Greek yogurt and eggs from the refrigerator about 30 minutes before baking. Room-temperature ingredients blend more smoothly and create a lighter, more even cake texture.
• Wash and dry the key limes thoroughly. Using a microplane, zest the limes first, collecting only the bright green outer peel while avoiding the bitter white pith.
• Cut the key limes in half and squeeze enough juice to measure ¼ cup. Strain the juice to remove seeds and excess pulp.
• In a medium mixing bowl, whisk together the almond flour, oat flour, whey protein isolate, oat fiber, coconut flour, baking powder, baking soda, and sea salt until completely combined.
• In a separate large mixing bowl, combine the eggs and powdered monk fruit sweetener.
• Beat with a hand mixer on medium speed for 2 to 3 minutes until the mixture becomes pale, fluffy, and slightly increased in volume.

• Add the Greek yogurt, melted butter, avocado oil, vanilla extract, optional key lime extract, fresh key lime juice, and key lime zest.
• Continue mixing until the wet ingredients become smooth, creamy, and fully incorporated.
• Gradually add the dry ingredients into the wet mixture in three separate additions, mixing on low speed after each addition.
• Stop mixing as soon as no dry flour remains visible. Overmixing can make protein-rich cakes dense.
• Allow the batter to rest for 5 minutes. This resting period allows the oat fiber and coconut flour to absorb moisture, resulting in a smoother batter and softer crumb.
• Transfer the batter into the prepared Bundt pan, spreading it evenly with a silicone spatula.
• Gently tap the Bundt pan on the countertop 2 to 3 times to remove any large air pockets trapped inside the batter.
• Place the Bundt pan onto the center oven rack.
• Bake for 45 to 55 minutes, or until the cake develops a rich golden-brown exterior and a toothpick inserted into the thickest section comes out with only a few moist crumbs attached.
• Begin checking for doneness after 42 minutes since oven temperatures vary.
• If the cake begins browning too quickly before the center finishes baking, loosely cover the top with aluminum foil during the final 10 to 15 minutes.
• Remove the cake from the oven and place the pan on a cooling rack.

• Allow the cake to cool inside the pan for 15 minutes. This helps the cake set while making it easier to release without breaking.
• Carefully invert the Bundt pan onto the cooling rack and gently lift the pan away. If properly greased, the cake should release cleanly with its decorative ridges intact.
• Allow the cake to cool completely before adding the glaze.
• While the cake cools, prepare the sugar-free glaze by whisking together the powdered monk fruit sweetener, Greek yogurt, fresh key lime juice, and key lime zest until smooth.
• If the glaze is too thick, whisk in almond milk one teaspoon at a time until it slowly flows from the whisk while remaining thick enough to coat the cake.
• Place the cooled cake onto a serving platter.
• Slowly drizzle the glaze over the top, allowing it to cascade naturally down the sides just like the glossy finish shown in the reference image.
• Garnish with freshly grated key lime zest and optional thin lime slices for an elegant bakery-style presentation.
• Allow the glaze to set for 15 minutes before slicing.
• Slice into 12 even servings using a sharp serrated knife, wiping the blade clean between cuts for neat slices.

Recipe Information

• Prep Time: 25 minutes
• Bake Time: 50 minutes
• Cooling Time: 30 minutes
• Total Time: 1 hour 45 minutes
• Servings: 12 slices
• Cuisine: American
• Course: Dessert, Snack, Breakfast

Flavor Profile Breakdown

• Bright fresh key lime flavor.
• Soft, buttery pound cake texture.
• Moist, tender crumb.
• Light citrus tang from Greek yogurt.
• Refreshing aromatic lime zest.
• Gentle vanilla sweetness.
• Smooth sugar-free citrus glaze.
• Slight nutty richness from almond flour.
• Rich yet balanced finish.
• Refreshing citrus aroma in every bite.

Pro Tips for Best Results

• Use freshly squeezed key lime juice for the brightest flavor.
• Zest the limes before juicing them.
• Bring all refrigerated ingredients to room temperature before mixing.
• Measure almond flour using a kitchen scale whenever possible.
• Grease every detail of the Bundt pan thoroughly.
• Avoid overmixing once the dry ingredients are added.
• Let the batter rest before baking.
• Cool the cake completely before glazing.
• Allow the glaze to set before slicing.
• Store overnight before serving if possible, as the lime flavor becomes even more vibrant the following day.

Variations & Substitutions

• Add fresh blueberries for a key lime blueberry Bundt cake.
• Fold unsweetened shredded coconut into the batter.
• Replace Greek yogurt with blended low-fat cottage cheese.
• Add chopped pistachios for texture.
• Substitute lemon juice and zest for a lemon Bundt variation.
• Mix poppy seeds into the batter for added crunch.
• Add almond extract for a richer bakery flavor.
• Sprinkle toasted coconut over the glaze.
• Replace avocado oil with melted coconut oil.
• Garnish with sugar-free white chocolate shavings for special occasions.

Common Mistakes to Avoid

• Using bottled lime juice instead of fresh key limes.
• Forgetting to grease every groove of the Bundt pan.
• Overmixing the batter.
• Opening the oven door repeatedly during baking.
• Removing the cake from the pan too early.
• Adding the glaze while the cake is still warm.
• Measuring protein powder inaccurately.
• Overbaking until the cake becomes dry.
• Skipping the batter resting period.
• Slicing before the glaze has fully set.

Serving Suggestions

• Serve the Bundt cake completely cooled so the glossy key lime glaze has time to set into a beautiful bakery-style finish.
• Enjoy a slice with a cup of freshly brewed coffee, espresso, or unsweetened green tea for a refreshing afternoon treat.
• Add a spoonful of plain non-fat Greek yogurt beside each slice for extra protein and a creamy contrast to the citrus flavor.
• Pair with fresh raspberries, blueberries, or strawberries for a naturally sweet diabetic-friendly dessert plate.
• Garnish each serving with a little freshly grated key lime zest just before serving for the brightest citrus aroma.
• Top with a few chopped roasted pistachios or sliced almonds for added crunch, healthy fats, and protein.
• Serve lightly chilled during warm weather for an even more refreshing dessert.
• Enjoy with a high-protein vanilla smoothie for a satisfying breakfast or post-workout snack.
• Slice into smaller portions for brunches, birthdays, baby showers, or holiday dessert tables.
• Finish each slice with a fresh mint leaf for an elegant presentation that complements the vibrant lime flavor.

Storage & Reheating Tips

• Allow the cake to cool completely before storing.
• Store in an airtight cake container at room temperature for up to 2 days.
• Refrigerate for up to 6 days for maximum freshness.
• Keep the glaze intact by storing the cake in a single layer whenever possible.
• Wrap individual slices in plastic wrap for convenient grab-and-go snacks.
• Freeze individual slices in freezer-safe bags for up to 3 months.
• Thaw overnight in the refrigerator or for about 30 minutes at room temperature.
• If serving chilled, allow each slice to sit at room temperature for 10–15 minutes to soften slightly.
• Avoid microwaving the glazed cake, as the glaze may become too thin.
• Store away from direct sunlight and humidity to preserve its moist texture.

Nutrition Information (Approximate)

• Calories: 228 kcal
• Protein: 14 g
• Carbohydrates: 10 g
• Fat: 16 g
• Fiber: 4 g
• Sugar: 2 g
• Sodium: 178 mg

Final Thoughts

This High-Protein Diabetic-Friendly Key Lime Greek Yogurt Bundt Cake delivers everything you want from a classic citrus dessert while using smarter ingredients that support a healthier lifestyle. Its incredibly moist crumb, refreshing key lime flavor, and glossy sugar-free glaze create a beautiful centerpiece that’s just as suitable for special occasions as it is for everyday enjoyment.

By replacing refined sugar and white flour with almond flour, oat flour, whey protein isolate, Greek yogurt, and monk fruit sweetener, this recipe provides a satisfying protein boost with a lower glycemic impact than traditional Bundt cakes. Every slice is rich, tender, and bursting with fresh citrus flavor while remaining wonderfully light and moist.

Whether you’re baking for family, celebrating a special occasion, or simply treating yourself to a homemade dessert, this Bundt cake offers bakery-quality results with wholesome ingredients. It’s easy to prepare, stores beautifully, and is sure to become a favorite recipe for anyone who loves bright citrus desserts.

FAQs

Can people with diabetes enjoy this Bundt cake?

Yes. The recipe uses diabetic-friendly monk fruit sweetener, higher-protein ingredients, and alternative flours instead of refined sugar and white flour, making it a more balanced dessert when enjoyed in moderation.

Why is this cake high in protein?

Greek yogurt, whey protein isolate, almond flour, and eggs all contribute to a significantly higher protein content than a traditional Bundt cake.

Can I substitute regular limes for key limes?

Yes. Regular Persian limes can be used if key limes aren’t available, although the flavor will be slightly less aromatic.

Can I make this cake without the glaze?

Absolutely. The cake is moist and flavorful on its own, and the glaze is optional.

Why did my cake stick to the Bundt pan?

Bundt pans must be thoroughly greased, including every groove and curve. Dusting lightly with almond flour also helps ensure a clean release.

Can I freeze the whole cake?

Yes. Wrap the completely cooled, unglazed cake tightly in plastic wrap and aluminum foil before freezing for up to three months. Add the glaze after thawing for the freshest appearance.

Can I replace Greek yogurt with cottage cheese?

Yes. Blend low-fat cottage cheese until smooth before measuring it. This provides a similar creamy texture with additional protein.

Why should the batter rest before baking?

Resting allows the oat fiber and coconut flour to absorb moisture, creating a smoother batter and a softer, more even crumb.

Can I make this recipe as muffins?

Yes. Divide the batter into a lined muffin pan and bake for approximately 20 to 24 minutes, checking for doneness with a toothpick.

How do I keep the cake moist for several days?

Store it in an airtight container after it has cooled completely. The Greek yogurt and almond flour help retain moisture, keeping the cake tender for days.