Yule Sour Cream Walnut Cake

1/2 cup butter
1 cup sugar
2 eggs
1 teaspoon vanilla
1/2 pint sour cream
1 teaspoon baking powder
1 teaspoon baking soda
2 cups flour
7 walnut halves, whole

Topping:
1/2 cup chopped walnuts
1 teaspoon cinnamon
1/4 cup sugar

Mix topping ingredients; set aside. Cream butter and sugar; mix in eggs and vanilla, then sour cream. Sift together flour, soda, and baking powder; fold into butter mixture until smooth.Pour 1/3 of batter into a greased, lightly floured tube pan. Sprinkle top of batter in pan with 1/3 topping mixture. Repeat procedure 2 more times. Decoratively arrange walnut halves on top of batter, sinking them slightly.

Bake at 350 degrees for 45 to 60 minutes. Cake is done when no batter sticks to toothpick or thin knife. Test frequently toward end of time to avoid over-baking.Let cake pan cool on racks. When comfortable to touch, flip pan over and gently ease cake out. Flip cake over again onto cooling rack so that the walnuts are on top. Cool before removing to serving tray. Serve by the slice.