Fluffy Banana Yogurt Protein Coffee Cake

Preheat oven to 350°F (175°C). Grease an 8×8-inch pan or line with parchment.

In a large bowl, whisk mashed bananas, egg yolks, yogurt, and vanilla extract until smooth.

In a separate bowl, sift together flour, sugar, protein powder, baking powder, and salt.

Fold the dry ingredients into the wet mixture just until combined. Do not overmix.

Beat the egg whites to soft peaks, then gently fold them into the batter to create a light, airy texture.

Pour batter into prepared pan and bake for 35 min, until a toothpick inserted into the center comes out clean.

Allow to cool in the pan on a rack for 10 minutes, then remove and cool completely before slicing.