1 box yellow cake mix
2/3 c. oil
4 eggs
2 tbsp. cinnamon
1 c. brown sugar
2 1/2 c. powdered sugar
1/2 c. milk
1 tsp. vanilla
3/4 container (16 oz.) sour cream

Mix cake mix, oil, sour cream and eggs well. Pour batter in a slightly greased 9 x 13 pan. Mix cinnamon and brown sugar; sprinkle over batter. Take fork and swirl into batter, using back of fork.

Bake at 350°F for 35 to 45 minutes or until done.

Mix powdered sugar, milk and vanilla together. Poke holes in cake with fork; pour over cake while still hot.