01 -
Preheat oven to 218°C (425°F). Spray a 12-count muffin pan with nonstick spray or line with paper liners.
02 -
In a medium bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, and nutmeg. Set aside.
03 -
In a large bowl, mash the bananas thoroughly. Beat in the melted butter, brown sugar, egg, vanilla extract, and milk until well combined.
04 -
Pour the dry ingredients into the wet ingredients and mix until just combined. Fold in nuts or chocolate chips if using. The batter will be thick.
05 -
Spoon the batter into the prepared muffin cups, filling them completely to the top for nicely domed muffins.
06 -
Bake at 218°C (425°F) for 5 minutes, then reduce oven temperature to 177°C (350°F) without removing muffins. Continue baking for 16-18 minutes or until a toothpick inserted in the center comes out clean.
07 -
Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.