Peanut Butter Crunch Cake

1.  Add cake mix, peanut butter, and brown sugar to a mixing bowl.
2.  Beat on low speed until crumbly.
3.  Set aside 1/2 cup crumb mixture.
4.  Add water, eggs, and oil to remaining crumb mixture; beat on low speed until moistened.
5.  Beat on high speed for 2 minutes.
6.  Add in 1/4 cup each of the chocolate chips and peanut butter chips; stir to combine.
7.  Pour batter into a greased 13 x 9 inch baking dish.
8.  Mix together the peanuts, reserved crumb mixture, and remaining chips; sprinkle evenly over the batter.
9.  Bake at 350 degrees for 40-45 minutes or until a pick comes out clean.
10.  Cool completely.

source:allrecipes.dom