Preheat oven to 350°F. Prepare a regular muffin pan with 9 paper liners.
In a small bowl, mash banana until smooth. For a super smooth consistency, blend in a small food processor or blender.
In a large bowl or stand mixer, cream together butter and sugar. Mix in egg and vanilla, followed by salt and baking powder. Scrape the bowl as needed. Add flour, mixing until just combined. Mix in banana, beating until smooth and no streaks remain. Stir in 3/4 cup chocolate chips by hand. Divide batter between prepared liners using a large cookie scoop. Sprinkle mini chocolate chips over the top of each portion of batter before baking.
Bake muffins for 18-20 minutes or until a toothpick inserted comes out clean. Cool in pan until easy to handle. Transfer to a wire rack to cool completely. Store in an airtight container for up to several days. Muffins may also be frozen.
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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