1 (18.25 oz.) pkg. yellow cake mix with pudding
4 eggs
2/3 c. vegetable oil
1/3 c. water
1 (8 oz.) carton sour cream
1/2 c. firmly packed brown sugar
1 tsp. ground cinnamon
2/3 c. chopped pecans (optional)

GLAZE:

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

Combine first 5 ingredients in a mixing bowl; beat at medium speed with an electric mixer until smooth. Set aside. Combine brown sugar and cinnamon and pecans. Set aside.

Pour half of batter in a greased and floured 9x13x2 inch baking pan. Sprinkle half of sugar mixture over batter. Repeat procedure. Gently swirl batter with a knife. Bake at 350 degrees for 30-35 minutes. Remove from oven. Drizzle glaze over cake and cool.

GLAZE: Combine all ingredients, beat at medium speed with electric mixer until smooth.