Preheat oven to 350°F (175°C). Line or grease a muffin tin
In a blender, add bananas, eggs, peanut butter, honey/maple, vanilla, baking soda, salt, and cocoa powder. Blend until smooth
Stir in ½ cup chocolate chips by hand
Divide batter into muffin cups (fills to top)
Bake 18–20 minutes, until a toothpick comes out mostly clean
Cool 5 minutes, then transfer to a rack
