If you love the bold, savory flavors of a Philly cheesesteak but want a satisfying low-carb dinner that’s warmer and heartier than a sandwich, this Keto Low-Carb Philly Cheesesteak Casserole delivers big flavor in one delicious dish. Think tender slices of seasoned steak, melted cheese, caramelized peppers and onions — all layered together and baked until bubbly. This casserole turns the essence of the classic sandwich into a cheesy, crowd-pleasing dinner without any bread, making it perfect for anyone following a keto or low-carb lifestyle.
Not only does this casserole hit every craving note — rich, melty, and deeply savory — it also makes great leftovers for lunches or easy reheat dinners during a busy week. With wholesome ingredients and robust flavors, it’s comfort food that still fits your goals.
Why You’ll Love This Recipe
- All the flavor of a Philly cheesesteak without the carbs
- One-dish meal — easy cleanup
- Packed with tender steak and melty cheese
- Great for meal prep or family dinners
- Customizable with your favorite low-carb toppings
Ingredients
- 1½ lbs (680 g) ribeye or beef sirloin, thinly sliced
- 1 tbsp olive oil
- 1 large green bell pepper, sliced
- 1 large yellow onion, sliced
- 1 tsp garlic powder
- ½ tsp salt
- ½ tsp black pepper
- 2 cups shredded provolone or mozzarella cheese
- ½ cup beef broth
- ¼ cup heavy cream
- Optional: sliced mushrooms or hot sauce
How to Make Keto Low-Carb Philly Cheesesteak Casserole
- Preheat oven to a moderate baking temperature
- Heat olive oil in a large skillet over medium-high heat
- Add sliced onions and bell peppers
- Sauté until tender and lightly caramelized
- Remove vegetables from skillet and set aside
- Add sliced steak to the skillet
- Season with garlic powder, salt, and black pepper
- Cook until beef is browned but still juicy
- Return cooked peppers and onions to the skillet
- Pour beef broth and heavy cream into the mixture
- Stir to combine and simmer briefly
- Transfer mixture into a casserole dish
- Sprinkle shredded cheese evenly over the top
- Bake until cheese is melted and bubbly
- Remove from oven and let rest briefly
- Serve warm and enjoy
Recipe Information
Prep Time: 10 minutes
Cook Time: 25 minutes
Total Time: 35 minutes
Servings: 4–6
Cuisine: American-inspired
Course: Dinner / Main
Flavor Profile Breakdown
- Savory, tender seasoned beef
- Rich cheesy creaminess
- Sweet caramel notes from onions
- Earthy crunch from peppers
- Balanced savory spices
Pro Tips for Best Results
- Slice steak thinly for quick cooking
- Don’t overcrowd the pan when browning beef
- Use freshly shredded cheese for optimal melt
- Let casserole rest before serving
- Add mushrooms or hot sauce for extra depth
Variations & Substitutions
- Substitute chicken or turkey for beef
- Use provolone and mozzarella blend
- Add jalapeños for heat
- Top with pickled banana peppers
- Use smoked gouda for richer flavor
Common Mistakes to Avoid
- Cutting beef too thick causing uneven cooking
- Skipping seasoning on vegetables
- Using pre-shredded cheese (less melty)
- Overcooking vegetables until mushy
- Baking without evenly distributing toppings
Serving Suggestions
- Pair with cauliflower mash
- Serve with side salad
- Add keto flatbread or chaffles
- Enjoy with keto ranch or mustard sauce
- Serve with roasted asparagus
Storage & Reheating Tips
- Refrigerate leftovers in airtight container
- Keeps well for up to 3–4 days
- Reheat in oven or skillet for best texture
- Avoid microwaving to retain crispness
- Freeze portions up to 3 months
Nutrition Information (Approximate)
Calories: 480 kcal
Protein: 36 g
Carbohydrates: 6 g
Fat: 32 g
Fiber: 2 g
Sugar: 4 g
Sodium: 820 mg
Keto Low-Carb Philly Cheesesteak Casserole
Ingredients
Method
- Preheat oven to a moderate baking temperature
- Heat olive oil in a large skillet over medium-high heat
- Add sliced onions and bell peppers
- Sauté until tender and lightly caramelized
- Remove vegetables from skillet and set aside
- Add sliced steak to the skillet
- Season with garlic powder, salt, and black pepper
- Cook until beef is browned but still juicy
- Return cooked peppers and onions to the skillet
- Pour beef broth and heavy cream into the mixture
- Stir to combine and simmer briefly
- Transfer mixture into a casserole dish
- Sprinkle shredded cheese evenly over the top
- Bake until cheese is melted and bubbly
- Remove from oven and let rest briefly
- Serve warm and enjoy
Notes
- Protein: 36 g
- Carbohydrates: 6 g
- Fat: 32 g
- Fiber: 2 g
- Sugar: 4 g
- Sodium: 820 mg
Final Thoughts
This Keto Low-Carb Philly Cheesesteak Casserole delivers everything you love about a classic cheesesteak — hearty meat, melty cheese, and rich sautéed veggies — in a cozy, oven-baked format that’s perfect for low-carb living. It’s simple enough for weeknights and satisfying enough for weekend dinners with family.
FAQs
Can I make this casserole ahead of time?
Yes! Assemble and refrigerate before baking when you’re ready.
Can I use frozen steak slices?
Yes, but thaw and pat dry before cooking for best results.
Is this recipe gluten-free?
Yes — no gluten-containing ingredients are used.
Can I add extra vegetables?
Definitely. Mushrooms, spinach, or zucchini work well.
How do I keep the cheese from separating?
Use freshly shredded cheese and avoid overheating in the oven.
