½cupchipped unsweetened coconut,plus extra for topping
Preheat the oven to 350ºF. Line a 12 cup muffin tin with paper liners.
In the bowl of a stand mixer fitted with the paddle attachment, combine flour, sugar, baking powder, and baking soda. Add the coconut oil and mix. Add the egg, milk, vanilla, and mashed bananas to the mixture and mix well. Gently fold in walnuts and coconut.
Divide the batter evenly amongst the muffin cups. Top with extra coconut if desired. Bake 24-26 minutes or until a toothpick inserted in the center of a muffin comes out clean. Allow the muffins to cool in the pan for 10 minutes before transferring to a wire rack to cool completely.