1 box yellow cake mix
3/4 c. oil
4 eggs
1 c. sour cream
1/2 c. sugar

Mix above listed ingredients. Put 1/2 of batter in 9 x 13 inch pan. Blend 1 cup brown sugar and 3 tablespoons cinnamon. Sprinkle brown sugar and cinnamon over batter and swirl with a knife. Pour rest of the batter over brown sugar and cinnamon and swirl again. Bake at 300 degrees for 45 minutes.

GLAZE:

2 c. confectioners' sugar
4 tbsp. milk
1 tbsp. vanilla

Combine.