Banana Crumb Muffins

Details

Ingredients

• 1 ½ cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• ½ teaspoon salt
• 3 bananas, mashed
• ¾ cup white sugar
• 1 egg, lightly beaten
• ⅓ cup butter, melted
• ⅓ cup packed brown sugar
• 2 tablespoons all-purpose flour
• ⅛ teaspoon ground cinnamon
• 1 tablespoon butter