1/2 c. butter
1 c. sugar
2 eggs
2 c. flour
1 tsp. baking soda
1 tsp. baking powder
1/2 tsp. salt
1 c. sour cream
1 tsp. vinegar

Cream butter and sugar. Beat in eggs, one at a time. Sift dry ingredients together. Alternate adding dry ingredients and sour cream to sugar mixture. Pour batter into pan. Sprinkle topping on batter, then swirl topping down into batter. Bake at 350 degrees for 30 minutes.

TOPPING MIXTURE:

1/3 c. brown sugar
1/4 c. white sugar
1 c. chopped nuts
1 tsp. cinnamon

Mix well and sprinkle over coffee cake.