1 box yellow cake mix
3/4 c. oil
1 c. buttermilk (can use sweet milk)
4 tbsp. sugar
3 eggs

Mix together and pour into a 9"x13" pan. Mix 3/4 cup brown sugar and 4 teaspoons cinnamon and pour on top. With a knife, twirl through cake mix. Bake at 350 degrees for 25 to 30 minutes. After cake has cooled, mix 1 cup powdered sugar and 4 tablespoons milk and pour on top.