Banana Nut Muffins

Preheat oven to 350°F and line a muffin pan.

Whisk flour, baking powder, baking soda, salt, and cinnamon.

Mix butter, sugars, egg, vanilla, and mashed bananas.

Combine wet and dry ingredients, then fold in nuts.

Fill muffin cups and bake 20–25 minutes until set.

Cool slightly before serving.