3 large ripe bananas (easily mashable)
1/3 cup melted butter
3/4 cup brown sugar (packed, light or dark)
1 teaspoon salt (1/2 a teaspoon if using salted butter)
1 large egg, beaten
1 teaspoon vanilla extract
1 1/4 cup all purpose flour
1/4 cup natural unsweetened cocoa powder
1 teaspoon baking soda
1/4 teaspoon ground allspice
1/2 cup semi-sweet chocolate chips
Special equipment: 1 5×9-inch loaf pan
1 Prepare pan and preheat oven: Butter or spray with cooking spray the inside of a 5×9-inch loaf pan. Preheat oven to 350°F (175°C) with a rack in the middle.
2 Purée bananas: Using a blender, food processor, or a fork, purée the peeled ripe bananas until smooth. You should have 1 1/2 to 1 3/4 cups of banana purée.
3 Mix wet ingredients and sugar: Place the banana purée into a large mixing bowl. Stir the melted butter. Stir in the brown sugar and salt. Whisk to break up any clumps of brown sugar. Stir in the beaten egg and vanilla extract.
4 Mix dry ingredients: In a separate bowl, vigorously whisk together the flour, cocoa, baking soda, and allspice.
5 Add the flour mixture to the banana mixture and stir until just incorporated. Stir in the chocolate chips.
6 Spray cooking spray inside loaf pan
7 Pour batter into a buttered loaf pan. Place in a 350°F (175°C) oven and bake for 1 hour. One way to test is to gently push the center top of the chocolate banana bread down with your finger. If it feels relatively firm and bounces back when you release your finger, that’s a good sign that it’s done.
7 Let cool: Remove from oven and let cool for 10 minutes in the pan. Gently remove the loaf from the pan and place on a rack to cool completely.
Original of the video here