Prep your bananas. Slice ripe bananas and freeze them in a single layer until solid.
Store in a freezer-safe bag. This prevents clumping and makes blending easier.
Measure your base. Add 2 cups of frozen banana slices to a high-speed blender or food processor.
Pour in protein. Add 3/4 to 1 cup of vanilla protein shake. Start with less; you can always add more for a softer texture.
Blend. Pulse to break up chunks, then blend on medium, scraping down the sides as needed.
Aim for a thick, smooth, soft-serve consistency.
Adjust texture. If it’s too thick, add a splash more protein shake. If it’s too soft, blend in a few extra frozen banana slices or pop the mixture into the freezer for 10–15 minutes.
Taste and tweak. For extra flavor, blend in a pinch of salt, a splash of vanilla, or a teaspoon of cocoa powder. Keep it simple to stay low-calorie.
Serve. Scoop into bowls and enjoy right away for soft-serve, or transfer to a loaf pan, cover, and freeze 30–60 minutes for a firmer scoop.