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

Combine first 5 ingredients in a mixing bowl. Beat at medium speed with an electric mixer until smooth; set aside.

Combine brown sugar, cinnamon, and pecans for topping, set aside.

Pour half of batter in a greased and floured 9x13x2 inch baking pan. Sprinkle half of topping, pour remaining batter, sprinkle remaining topping. Bake at 350 degrees for 30 minutes.