A tasty way to use up over-ripe bananas and so easy to make.
Preheat oven to 350 degrees. Spray muffin cups with cooking spray or use paper liners.
With an electric mixer, cream butter and sugar. Beat in egg, mashed banana, and vanilla.
In a separate bowl, combine flour, salt, baking powder, and baking soda. Mix well, then add to the wet ingredients until blended. Add chopped walnuts.
Fill muffin cups about 2/3 full with batter. Bake for 25 minutes or until toothpick inserted in center of muffin top comes out clean.
Remove muffins to a wire rack to cool.
Do not over-mix the batter or the muffins will be tough.
Use the same recipe if you prefer mini-muffins, but adjust the cooking time as necessary.