1 pkg. yellow cake mix (including pudding)
1/2 c. firmly packed brown sugar
1 c. chunky peanut butter
1 c. water
1/4 c. vegetable oil
2 eggs
1/2 c. semi-sweet chocolate chips
1/2 c. peanut butter chips
1/2 c. chopped peanuts

In a large bowl, combine cake mix and pudding, brown sugar and peanut butter. With an electric mixer, beat at low speed until well combined. Reserve 1 cup of this mixture and set aside. To the remaining mixture add water, oil and eggs. Mix at low speed until moistened. Then beat at high speed for 2 minutes. Fold 1/4 cup of the chocolate chips and 1/4 cup of the peanut butter chips into the batter. Spoon into a greased, floured 9x13 inch pan.

In a small bowl, combine the rest of the chocolate chips, peanut butter chips and chopped peanuts with the 1 cup of reserved peanut butter mixture. Sprinkle the top of the cake with this mixture as evenly as possible. Bake in a preheated 350 degree oven for 30 to 40 minutes or until cake tests done. Immediately after removing from oven, sprinkle additional peanut butter chips over the top and press gently into the cake.