preheat oven to 350˚
grease a 15x10x1 baking sheet, set aside
whip the butter with an electric mixer until soft and fluffy, scrape the bowl down few times if using a stand mixer
beat in the sugars
add the egg and beat well
mix in the mashed bananas and vanilla paste or extract
in a separate bowl mix the flour, baking powder, salt and cinnamon
stir the flour mix into the butter banana mixture
mix until completely incorporated
set aside two spoonfuls of mini chocolate chips then stir in the remaining chocolate chips
spread in the greased 15x10x1 baking sheet
sprinkle with the remaining mini chocolate chips
bake in 350˚ for 25-28 minutes or untit the bars are puffy and baked through