Mix:

2 sticks of butter
1 c. sugar
2 eggs
1 tsp. vanilla

Beat well.

Mix:

2 c. flour
1 tsp. baking powder
1 tsp. baking soda
1 1/2 c. sour cream (add last)

TOPPING:

1/4 c. sugar
1 tsp. cinnamon

Mix the above 2 groups together; then blend in 1 1/2 cups sour cream. Mix 1/2 cup walnuts into batter. Line baking pan with aluminum foil. Add 1/2 of the batter to the pan. Sprinkle topping of sugar, cinnamon and nuts. Add last 1/2 of the batter, sprinkle topping. Bake at 350 degrees for 40 minutes.