01 -
Preheat oven to 375ºF. Line two baking sheets with parchment paper.
02 -
Combine the flour, cornstarch, baking powder, baking soda, and salt in a small bowl.
03 -
In a large bowl, beat the butter and brown sugar until light and fluffy. Beat in the mashed banana, vanilla extract, and egg until well blended.
04 -
Using a silicone spatula, stir the flour mixture into the banana mixture until well combined.
05 -
Using a 1.5-tablespoon cookie scoop, drop cookies onto the prepared baking sheet about 2 inches apart.
06 -
Bake for 10 minutes or until cookies are lightly browned. Cool the cookies on the pan for 5 minutes before transferring them to a wire rack to cool completely.