01 -
Preheat oven to 350°F (175°C) and coat a 17×11-inch rimmed baking sheet with nonstick cooking spray.
02 -
In a large mixing bowl, beat the softened butter with brown sugar and granulated sugar until the mixture is creamy and well combined.
03 -
Mix in vanilla extract, eggs, and mashed banana until the batter is fully incorporated.
04 -
Add all-purpose flour, baking soda, and kosher salt to the bowl. Beat just until combined without over-mixing.
05 -
Stir in 1 cup of the mini chocolate chips, reserving the remaining 1/4 cup for topping.
06 -
Evenly spread the batter into the prepared baking sheet and sprinkle the remaining 1/4 cup mini chocolate chips on top.
07 -
Bake for 18–22 minutes or until golden brown and a tester inserted into the center comes out with a few moist crumbs.
08 -
Allow to cool completely in the pan before slicing into squares and serving.