01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease cups.
02 - In a large bowl, whisk together mashed bananas, eggs, oil, brown sugar, milk, and vanilla extract until fully combined.
03 - In a separate bowl, sift together flour, baking soda, baking powder, cinnamon, and salt.
04 - Gradually fold dry ingredients into wet mixture just until combined. Do not overmix.
05 - Gently fold in chocolate chips, reserving a few for topping if desired.
06 - Divide batter evenly among muffin cups, filling each about ¾ full. Sprinkle reserved chocolate chips on top.
07 - Bake for 18-22 minutes until a toothpick inserted into center comes out clean or with a few moist crumbs.
08 - Let muffins cool in pan for 5 minutes, then transfer to wire rack to cool completely.