1 yellow cake mix (do not follow cake box directions)
2 eggs
3/4 cup oil
1 cup sour cream
1/2 stick melted butter
1 tbsp. mayonnaise
1 cup brown sugar
1/4 cup cinnamon
1/4 cup granulated sugar, if desired
1/2 box powdered sugar
1 tsp. vanilla
1/4 cup milk

Combine cake mix, eggs, oil, sour cream, butter and mayonnaise, mix well. In another bowl, combine brown sugar, cinnamon and granulated sugar. Pour 1/2 of batter in a greased and floured pan. Sprinkle cinnamon mixture over batter. Pour remaining batter over and spread. Sprinkle cinnamon mixture over batter.

Bake at 325°F for 35-40 minutes. Prepare glaze by combining powdered sugar, vanilla and milk. Pour glaze over hot cake.