1 pkg. yellow cake mix
1 c. sour cream
4 eggs
1/3 c. oil
1 c. packed brown sugar
3 tsp. cinnamon
2 c. powdered sugar
3 to 4 tbsp. milk

Combine first 4 ingredients. Mix well. Pour into greased and floured 9 x 13 inch pan. Mix brown sugar and cinnamon. Sprinkle over batter. Swirl with knife. Bake as on box. Combine powdered sugar and milk. Drizzle over warm cake.