Preheat oven to 350F.
Combine butter and sugars in stand mixer and mix on medium speed for 2 minutes until creamed and fluffy.
Add in banana, egg, and vanilla. Mix on medium speed for another 2 minutes.
In a separate bowl, mix together by hand the dry ingredients: flour, baking powder, baking soda and salt until just combined.
Slowly add dry ingredients into stand mixer. Mix on low speed until just combined.
Fold in chocolate chips on low speed until just combined.
Scoop batter onto a lined baking sheet. Approximately 2 Tbsp per cookie.
Bake for 12-14 minutes until a very light brown. Let cool and enjoy with a glass of milk!