01 - Preheat the oven to 350°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a large bowl, whisk together mashed bananas, eggs, vegetable oil, granulated sugar, brown sugar, and vanilla extract until smooth.
03 - In another bowl, sift together flour, baking soda, baking powder, and salt.
04 - Gradually fold the dry ingredients into the wet mixture until just combined—do not overmix.
05 - Gently fold in the chocolate chips.
06 - Divide the batter evenly among muffin cups, filling each about 3/4 full.
07 - Bake for 16–18 minutes or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
08 - Allow muffins to cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.