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Export 7 ingredients for grocery delivery
Step 1
Heat oven to 350 degrees Fahrenheit. Line muffin cups with paper liners. This recipe makes more than 12 muffins, so you will need to bake in batches.
Step 2
Whisk the flour, brown sugar, baking powder, baking soda, and salt in a large bowl.
Step 3
In another bowl, whisk the melted butter, mashed banana, egg, and vanilla until blended.
Step 4
Add the banana mixture to the bowl with dry ingredients then use a fork to combine. Do not over mix. Stir in chocolate. Fill muffin cups 3/4 full. Bake until a toothpick can be inserted and comes out clean, 20 to 25 minutes.