01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a large bowl, whisk together flour, cocoa powder, baking powder, baking soda, and salt.
03 - In a separate bowl, blend mashed bananas, sugar, vegetable oil, eggs, and vanilla extract until smooth.
04 - Gently fold wet mixture into dry ingredients until just combined; avoid overmixing to maintain texture.
05 - Fold chocolate chips into the batter evenly.
06 - Distribute batter evenly into prepared muffin cups. Optionally, sprinkle additional chocolate chips on top.
07 - Bake for 18 to 22 minutes until a toothpick inserted in the center comes out with moist crumbs.
08 - Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.