Beat dry cake mix, brown sugar and peanut butter until crumbly. Set aside ⅔ cup. Beat remaining crumbly mixture, water, oil and eggs until moistened. Beat an additional 2 minutes on high speed. Pour batter into a greased 9 X 13 inch pan. Stir nuts and chocolate chips into reserved ⅔ cup crumbly mixture and sprinkle over batter. Bake at 350 degrees F for 40-45 minutes.
Recipe by Nutrition Know How at https://nutritionknowhow.org/blog/b/bake-sale/