Ingredients

Cake:
1 cup butter, softened
1 1/2 cups sugar
2 eggs
1 1/2 teaspoons vanilla
2 cups flour
1 teaspoon baking powder
1 teaspoon baking soda
1 cup sour cream

Topping:
1/2 cup brown sugar
1/4 cup sugar
1 teaspoon cinnamon
1/2 cup walnuts, chopped

Preheat oven to 350. Butter a 9x13-inch baking pan. (Use a slightly smaller pan for thicker pieces of coffee cake.)

Cake: Cream butter in a mixing bowl. Gradually add sugar, eggs and vanilla, beating well after each addition. In a separate bowl, mix flour, baking powder and baking soda. Add flour mixture alternately with sour cream to creamed mixture.

Directions

Topping: Mix sugars and cinnamon.

Pour half of batter in pan. Sprinkle with walnuts and half of topping Add remaining batter and sprinkle remaining topping. Bake 45 minutes.