Streusel Coffee Cake

1 stick butter
1 cup sugar
2 eggs
8 oz sour cream
2 cups flour
1 teaspoon baking soda
1 teaspoon baking powder
1 teaspoon vanilla

Filling:
1/4 cup brown sugar
1 teaspoon cinnamon
1/2 cup chopped nuts

Cream together butter and sugar. Add remaining ingredients. Pour half of batter into angel food cake pan. Sprinkle half of filling over batter. Pour in remaining batter and sprinkle top with the rest of the filling.

Bake at 350 degrees for 40 minutes.

Mom’s alternate streusel topping: In bowl, mix together:
2/3 cup all purpose flour
1/2 cup packed brown sugar
4 tablespoons melted butter
1 teaspoon cinnamon

Add 1 cup chopped nuts. Sprinkle/crumble on top. Bake.