1/2 c. brown sugar, packed
3/4 c. peanut butter
1 pkg. yellow cake mix
3 eggs
1 c. water
1/3 c. chopped nuts
1 (6 oz.) pkg. semi-sweet chocolate chips

Heat oven to 350°F. Grease and flour oblong pan, 13 x 9 x 2-inches. In large mixer bowl, blend sugar, peanut butter and cake mix on low speed until crumbly. Reserve 2/3 cup crumb mixture; set aside. Blend remaining crumb mixture, the eggs and water on low speed until moistened, scraping bowl constantly. Beat on medium speed 4 minutes, scraping bowl occasionally. Spread batter in pan. Sprinkle reserved mixture over batter. Sprinkle chocolate chips and nuts over top.

Bake 40 to 45 minutes or until toothpick in center comes out clean.