Swirl and topping: 1/2 cup sugar mixed with 2 teaspoons cinnamon
Instructions
In a bowl, cream butter and sugar until light and fluffy.  Add one
egg at a time.  Stir in vanilla.   In a separate bowl, mix together
flour, baking powder, baking soda and salt.  Add dry ingredients
alternately with sour cream -- flour mixture added first and last --
to cream mixture.  Pour half of batter into a greased tube pan.
Marbelize 2/3 of the swirl and topping mixture. Pour remaining
batter in pan then sprinkle top with remaining swirl and topping
mixture.  Bake in a 350 degree oven for approximately 50 minutes.
Let cool on rack then remove from pan.