Preheat & Prep: Heat oven to 350°F (175°C). Line an 8-inch square baking pan with parchment paper.
Mix Wet Ingredients: In a large bowl, whisk together mashed bananas, yogurt, eggs, maple syrup, and vanilla until smooth.
Add Dry Ingredients: Sift in almond flour, oat flour, cocoa powder, protein powder, baking powder, baking soda, and salt. Stir gently until combined.
Fold in Chocolate Chips: Mix until evenly distributed.
Bake: Spread batter into the prepared pan and bake for 30 minutes, or until a toothpick comes out clean. Cool completely before frosting.
Make Frosting: Beat cream cheese, almond butter, maple syrup, and vanilla until smooth. Stir in chocolate chips.
Assemble: Spread frosting over cooled cake, slice, and enjoy.