1 box yellow cake mix
1/2 c. cooking oil
1 stick butter (softened)
4 eggs
1 c. sour cream
2 tbsp. sugar
1 tbsp. cinnamon

Blend cake mix, oil and butter. Beat in eggs, one at a time. Fold in sour cream. Pour half the batter into a greased and floured bundt pan. Sprinkle sugar and cinnamon mixture evenly over the batter. Pour remaining batter into the pan. Bake 45 minutes to 1 hour at 350 degrees.