Banana Muffins

1 1/2 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon baking powder
1/2 teaspoon salt
3 over-ripe bananas
3/4 cup white sugar
1 egg
1/3 cup butter

1. Preheat oven to 375 degrees F (190 degrees C).
2. Grease muffin pan.
3. Mix flour, baking soda, baking powder and salt.
4. Beat together bananas, sugar, egg and melted butter.
5. Combine two mixtures.
6. Pour batter into muffin pan.
7. Bake for 18 to 20 minutes.