1 box Duncan Hines white cake mix
3/4 c. oil
4 eggs
1 tsp. vanilla
3/4 c. sugar
1 c. sour cream
1 tsp. butter
2 tbsp. cinnamon

1. Grease and flour 2 loaf pans (8 1/2 x 4 1/2 x 2).

2. Stir together 2 tbsp. cinnamon with 4 tbsp. sugar. Set aside.

3. Mix all ingredients together (except for cinnamon-sugar mixture) for 2 minutes on medium.

4. Spread half the batter into the 2 pans.

5. Sprinkle half the cinnamon-sugar mixture over the batter.

6. Pour remaining batter over the mixture and top with remaining cinnamon-sugar mixture.

7. Twirl knife through better to get marble effect.

8. Bake for 50-60 minutes at 350 degrees.

9. Let pans cool for 5 minutes and remove to wire racks.

Can be frozen after cooled.