3/4 c. butter
1 1/2 c. sugar
1 1/2 tsp. vanilla
3 c. flour
1 1/2 tsp. baking powder
1 1/2 tsp. baking soda
1 pt. sour cream
4 eggs

FILLING:

1 c. ground nuts (fine)
2 tsp. flour
1 1/2 c. brown sugar
1 tsp. cinnamon

Cream butter and sugar. Add eggs one at a time. Beat until creamy. Sift flour, baking powder and soda. Add alternating with sour cream to butter mixture. Add vanilla. Mix until smooth. Set aside. Combine all "filling" ingredients in a bowl. In a 10 inch greased tube pan alternate layers of batter and filling.

Starting with batter and ending with batter. Cut through batter with knife for marble effect. Bake at 350 degrees for 1 hour 10 minutes. Cool. Sprinkle with powdered sugar.