Preheat oven to 350 degrees

Batter:
1 cup butter
1 & 1/4 cup sugar
2 eggs beaten
1 pint sour cream
1 tsp. vanilla
2 cups flour
1 tsp. baking powder
1/2 tsp. baking soda

Topping: 
6 Tbsp.sugar
1 & 1/2 tsp. cinnamon

(or make more topping if you want using this proportion)

Cream butter and sugar. Add beaten eggs and vanilla. Add flour with baking powder and soda. Grease and flour a bundt pan. Pour half of the batter into the pan. Sprinkle 1/2 of the topping on the batter. Then pour the second half of the batter on top. Sprinkle the rest of the topping on top. Bake at 350 degrees for 55 minutes.