Preheat oven to 350°F. Line a standard muffin pan with 10 paper liners.
In a large bowl or stand mixer, cream together butter and sugars until light and fluffy. Mix in vanilla and egg, followed by salt, baking powder and baking soda. Scrape bowl as needed. Sift cocoa powder directly over bowl, mix until just combined. Alternate additions of flour and mashed bananas until fully combined and no streaks remain. Mix in chocolate chips by hand.
Use a large cookie scoop to divide batter between prepared liners. If desired, add additional chocolate chips to the top of each portion of batter.
Bake for 18-20 minutes or until a toothpick inserted comes out clean.
Cool in pan for several minutes or until easy to handle. Store in an airtight container for up to several days or freeze for several months.
Nutritional information is provided as a courtesy and is an estimate only. Nutrition information can vary for a variety of reasons. For the most accurate data, use your preferred nutrition calculator with the actual ingredients you used to make this recipe.
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