Brownie Banana Bread

Name: Brownie Banana Bread
Prep time: 40 min
Cook time: 1 h 25 min
Total time: 2 h 5 min
Cuisine: American
Ingredients: 10 tablespoons (140g) unsalted butter; 3/4 cup plus 2 tablespoons (85g) natural unsweetened cocoa powder; 1 1/4 cups (250g) sugar; 1/4 teaspoon salt; 2 eggs, straight from the refrigerator; 1 teaspoon vanilla extract; 1/2 cup (65g) all-purpose flour; 1/3 cup (76g) unsalted butter; 3 medium very ripe bananas, peeled (1 1/4 to 1 1/2 cups mashed); 2/3 cup (137g) sugar; 1 large egg; 1 1/2 cups (205g) all-purpose flour; 1/2 teaspoon baking soda (not baking powder)