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, mash the bananas until completely smooth. Add eggs, vegetable oil, brown sugar, and vanilla extract. Whisk vigorously until the mixture is uniform and fully incorporated.
03 - In a separate medium bowl, sift together flour, baking powder, baking soda, and salt. Whisk briefly to ensure even distribution of leavening agents.
04 - Pour the dry ingredients into the wet mixture. Using a spatula, fold gently until just combined—stop mixing as soon as no dry flour remains visible. The batter should remain slightly thick.
05 - Sprinkle the chocolate chips over the batter and fold in gently with 2-3 strokes, being careful not to overwork the mixture.
06 - Divide the batter evenly among the 12 muffin cups, filling each about three-quarters full. Top each muffin with additional chocolate chips if desired.
07 - Bake for 18 to 22 minutes until golden brown. A toothpick inserted into the center should come out clean or with a few moist crumbs.
08 - Allow muffins to rest in the tin for 5 minutes, then carefully transfer to a wire rack. Cool completely before storing to maintain texture.