1 yellow cake mix
8 oz sour cream
3/4 cup oil
1 Tablespoon cinnamon
1 cup brown sugar
2 cups powdered sugar
1 Tablespoon vanilla extract
1 tsp cinnamon
4 Tablespoons milk
Mix cake mix, oil, eggs, and sour cream by hand, about 50 strokes.
Put half the batter into a 9 x 13 pan.
Combine brown sugar and cinnamon and spread over the entire cake. Spread the rest of the batter on top of this.
Make swirls in the cake using a knife.
Bake at 325 degrees for about 40 minutes.
Blend powdered sugar & cinnamon together, add milk and vanilla extract and spread on warm cake.