01 - Preheat the oven to 350°F. Line a standard 12-cup muffin tin with paper liners or lightly grease each cup.
02 - In a medium mixing bowl, thoroughly whisk together the all-purpose flour, unsweetened cocoa powder, baking soda, and salt.
03 - In a large mixing bowl, whisk together the mashed ripe bananas, vegetable oil (or melted unsalted butter), granulated sugar, large eggs, and vanilla extract until the mixture is smooth and well combined.
04 - Incorporate the dry ingredients mixture into the wet ingredients. Gently fold them together using a spatula until just combined; take care not to overmix the batter.
05 - Fold the 3/4 cup of chocolate chips into the batter until evenly distributed.
06 - Divide the prepared batter evenly among the 12 muffin cups. If desired, sprinkle additional chocolate chips on top of each filled cup.
07 - Bake for 18–22 minutes, or until a wooden toothpick inserted into the center of a muffin comes out with only a few moist crumbs attached.
08 - Allow the muffins to cool in the tin for 5 minutes before carefully transferring them to a wire rack to cool completely.