Original recipe yields 16 servings
Ingredient Checklist


Instructions Checklist
  • Preheat the oven to 325 degrees F (165 degrees C). Spray the bottom of an 8×8-inch metal baking pan with cooking spray.

  • Mix flour, cocoa, and 1/4 teaspoon plus a pinch of salt together in a bowl and set aside.

  • Melt butter in a medium saucepan over low heat. Add semisweet and bittersweet chocolate to melted butter and stir until smooth. Remove from heat; set aside for 2 to 3 minutes.

  • Meanwhile, mix brown sugar, eggs, and banana by hand until combined, about 1 minute. Add melted chocolate mixture to banana mixture and stir well, about 1 minute more. Mix flour mixture slowly into chocolate, stirring just enough to combine. Fold in walnuts and chocolate chips. Spread batter into the prepared pan.

  • Bake in the preheated oven until a toothpick inserted into the center comes out with moist crumbs, 35 to 40 minutes. Remove from the oven and let cool in the pan on a wire rack for at least 2 hours before cutting.