01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease lightly with cooking spray.
02 - In a large mixing bowl, whisk together mashed bananas, eggs, vegetable oil, granulated sugar, brown sugar, and vanilla extract until smooth and well combined.
03 - In a separate medium bowl, sift together all-purpose flour, baking soda, baking powder, and salt to ensure even distribution.
04 - Gradually fold the dry ingredients into the wet mixture using a spatula. Mix only until just combined—do not overmix or muffins will become tough.
05 - Gently fold in the semi-sweet chocolate chips until evenly distributed throughout the batter.
06 - Divide batter evenly among the prepared muffin cups, filling each about three-quarters full.
07 - Bake for 16 to 18 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
08 - Let muffins cool in the tin for 5 minutes before transferring to a wire rack to cool completely.