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

Cream butter and sugar. Add eggs, one at a time, then add sour cream and vanilla. Fold in dry ingredients. Pour batter into greased tube pan. Add filling, then rest of cake mixture.

Filling:

1 tbsp. cinnamon
4 tbsp. sugar

Bake at 350°F for 50 minutes.