Banana Crumb Muffins

Batter
1/2 C flour
1 teaspoon baking soda
1 teaspoon baking powder
1/2 teaspoon salt
3 overripe banans mashed
3/4 cups white sugar
1 egg lightly beaten
1/3 cup melted butter

Topping
1/3 cup packed brown sugar
2 tablespoons flour
1/8 teaspoon cinnamon
1 tablespoon butter

In bowl mix, flour, soda, powder, and salt. In another bowl mix bananas, egg, sugar, and butter. Stir banana mixture into flour mixture. Mix togther brown sugar, flour, and cinnamon for topping. Cut in butter until it resembles course cornmeal. Sprinkle topping over muffins and bake for 18-20 minutes at 375 degrees.