Step 2: Bake the cakes. Lightly grease two 6-inch cake pans with cooking spray. Place a round piece of parchment paper in the bottom of each pan to prevent sticking.

Preheat your oven to 350 degrees Fahrenheit. Grease a 12-cup muffin tin, or two 6-cup muffin tins, or line with paper muffin cups. In a large bowl, combine the peanut butter, eggs, bananas, and ...