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

Glaze:

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

Combine first 5 ingredients in a mixing bowl. Beat at medium speed with mixer until smooth. Set aside.

Combine brown sugar and cinnamon. Set aside.

Pour half of batter in a greased 9 x 13-inch pan. Sprinkle half of sugar mixture over batter. Repeat procedure. Gently swirl batter with a knife.

Bake at 350°F for 35 to 45 minutes. Remove from oven. Drizzle glaze over cake and cool.

Glaze: Combine all ingredients. Beat at medium speed until smooth.