Banana-Nut Coffee Cake

ingredient;
1/4 cup butter or margarine, softened
1/3 cup sugar
2 soft-ripe bananas, mashed
1/4 sour cream
1 egg
1 1/4 cups flour
1 tbs. baking powder
1/2 tsp. baking soda
1/4 tsp salt
1/4 tsp nutmeg
1/4 cup milk
1/3 cup chopped walnuts (optional)

Streusel Topping

1/4 cup flour
1/4 cup brown sugar
2 tbs. sugar
1/2 tsp. cinnamon
3 tbs. butter

method;
Preheat oven to 375 degrees. Grease an 8-inch square baking pan. In a large bowl cream butter and sugar until fluffy with electric mixer; Blend in banana, sour cream, and egg.

Mix flour, baking powder, soda, salt and nutmeg. Stir flour mixture into banana mixture alternately with milk, blending after each addition until combined.

In a small bowl mix flour, sugars, and cinnamon. Cut in butter until coarse crumbs form. Sprinkle the top with streusel, then with walnuts.

Bake for about 35-40 minutes. Let cool before cutting into squares.