Preheat oven to 350 degrees. Grease a 13x9 baking dish. In a mixing bowl beat cake mix, peanut butter and brown sugar on low until crumbly; set aside 1/2 cup. Add water, eggs and oil to mixing bowl and blend on low until moistened; beat on high 2 minutes. Stir in 1/4 cup each of the chips.
Pour into the greased baking dish. Combine the peanuts, reserved crumb mixture and remaining chips; sprinkle over the batter. Bake at 350 degrees 40-45 minutes or until toothpick comes out clean.