Preheat oven to 350 degrees.
Beat sugar, eggs, and oil together to combine.
Beat in mashed bananas and vanilla.
Combine flour, cocoa, baking soda, salt, and chocolate chips.
Stir into wet mixture until just combined.
Spray a standard sized loaf pan with nonstick spray and dust with flour, then pour in batter.
Bake for 60-70 minutes until top is cracked and bread is cooked through (when you gently touch the top it should spring back).