01 -
Heat your oven to 350°F (177°C). Put paper liners in a 12-cup muffin pan.
02 -
Grab a big bowl and mix your flour, brown sugar, baking powder, baking soda, and salt until they're all combined.
03 -
Take another bowl and mix your slightly cooled melted butter, squashed bananas, egg, and vanilla until smooth.
04 -
Add wet stuff to dry stuff and stir gently until just combined. Then gently add the chocolate chips.
05 -
Scoop batter into each liner, filling about 3/4 full. Bake for 20-25 minutes. They're done when a toothpick comes out clean from the middle. Cool them on a wire rack.