1 pkg. yellow cake mix
1 pkg. instant vanilla pudding
1/2 c. oil
1 c. sour cream
3/4 c. boiling water
4 eggs
1 tsp. vanilla
1 tsp. butter flavoring

Mix above ingredients with electric mixer. Spread 1/2 batter in greased 9 x 13 inch pan. Mix 1/2 cup sugar, 2 teaspoons cinnamon and 1/2 cup nuts. Sprinkle 1/2 of sugar mixture over batter in pan. Pour rest of batter on top and sprinkle on the remaining sugar mixture. Swirl around with a knife. Bake at 350 degrees for 30 to 35 minutes.