Banana Crumb Muffins

1 ½ cups flour
Topping:
1 tsp baking soda 1/3 cup brown sugar
1 tsp baking pd. 2 Tbsp. flour
½ tsp salt 1/8 tsp. cinnamon
3 mashed bananas 1 Tbsp. butter
¾ cup white sugar
1 egg
1/3 cup melted butter
½ cup chopped nuts (optional)

Preheat oven to 375 degrees. Fill muffin tin with muffin papers.

Mix flour, baking soda, baking pd, and salt. Then add bananas, sugar, egg, melted butter and nuts. Spoon batter into muffin cups.

In a small bowl, mix together brown sugar, 2 Tbsp. flour, cinnamon. Cut in 1 Tbsp. butter until resembles coarse cornmeal. Sprinkle over muffins.

Bake in preheated oven for 18-20 minutes, until a toothpick inserted comes out clean.