Banana Crumb Muffins

Preheat oven to 375°F. Lightly grease 10 muffin cups, or line with muffin papers.

In a large bowl, mix together 1 1/2 cups flour, baking soda, baking powder and salt. In another bowl, beat together the bananas, sugar, egg and melted butter. Stir the banana mixture into the flour mixture just until moistened. Spoon batter into the prepared cups.

In a small bowl, mix together the brown sugar, 2 tablespoons flour and cinnamon. Cut in 1 tablespoon butter until the mixture resembles coarse cornmeal. Sprinkle topping over the muffins.

Bake for 18 to 20 minutes, until a toothpick inserted into the center of a muffin comes out clean.