1 box yellow cake mix
3/4 c. oil
4 eggs
1 (8 oz.) carton sour cream
1 c. brown sugar
2 tbsp. cinnamon

Mix first 4 ingredients, stirring by hand until thoroughly mixed. Layer half of batter mixture in a 9"x13" cake pan. Sprinkle with brown sugar and cinnamon. Pour remaining batter on top. Swirl batter with a knife. Bake at 325 degrees for 40 minutes or until golden brown.

ICING:

2 c. powdered sugar
1/3 c. milk
1 tbsp. vanilla

Drizzle on top of cake while it is still hot.