Preheat oven to 350F and spray a 9 x 5 inch bread pan with cooking spray.
Lightly dust the inside of the pan with flour and set aside.
In a large bowl, sift flour, cocoa powder, baking powder, and baking soda and whisk to combine.
In the bowl of a stand mixer, beat softened butter, brown sugar, and cane sugar until smooth and fluffy.
Beat in eggs and mashed bananas until combined.
Add dry ingredients and chocolate chips and mix until combined, being careful not to overmix the batter.
Pour into the prepared bread pan and bake for 55 minutes to 1 hour.
Let cool in the pan for about 1 hour before transferring to a wire cooling rack.