Ingredients
Cooking spray, for pan
1/2 c. cocoa powder, plus more for dusting pan
1 c. all-purpose flour
1 tsp. baking soda
1/4 tsp. kosher salt
3/4 c. sugar
1/2 c. melted butter
1 large egg plus 1 large egg yolk
1/4 c. buttermilk or sour cream
1 tsp. pure vanilla extract
3 super-ripe bananas, mashed
1 c. semisweet chocolate chips
Preparation
Step 1Preheat oven to 350º and spray a 9"-x-5" loaf pan with cooking spray, then dust with cocoa powder.Step 2In a large bowl, whisk together flour, cocoa powder, baking soda, and salt.Step 3In another large bowl, combine sugar, butter, egg and egg yolk, buttermilk or sour cream, and vanilla until smooth. Pour wet ingredients over dry and stir until combined, then fold in mashed bananas and chocolate chips.Step 4Transfer batter to prepared baking dish and bake until a toothpick comes out clean, 1 hour. Let cool at least 10 minutes before slicing and serving.
