Preheat oven to 350°F (175°C)
Grease a baking dish with butter
Add cubed keto bread evenly into the dish
In a bowl, whisk eggs, almond milk, heavy cream, and melted butter
Add sweetener, vanilla, cinnamon, nutmeg, and salt
Pour the custard mixture evenly over the bread
Gently press bread down to absorb the liquid
Let sit for 10–15 minutes (or refrigerate overnight for best results)
Bake for 35–40 minutes until golden and set
Remove and cool slightly before serving
Top with berries or sugar-free syrup if desired