01 -
Preheat oven to 175°C. Line a muffin tin with paper liners or lightly grease each cup.
02 -
In a large mixing bowl, blend mashed bananas with melted butter until smooth.
03 -
Stir in brown sugar and granulated sugar until fully incorporated. Beat in the egg and vanilla extract until mixture is fluffy and uniform.
04 -
In a separate bowl, whisk together baking soda, baking powder, salt, and all-purpose flour.
05 -
Gradually add the dry ingredients to the wet mixture, stirring gently until just combined. Avoid overmixing; some small lumps are acceptable.
06 -
Gently fold in chocolate chips and, if using, chopped walnuts or pecans.
07 -
Divide batter evenly among muffin cups, filling each approximately two-thirds full.
08 -
Bake for 18–20 minutes, or until a toothpick inserted into the center emerges clean.
09 -
Allow muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely.