Heat oven to 350. Grease and flour 9 x 13 pan. In large bowl, combine cake mix, brown sugar and peanut butter at low speed until crumbly. Reserve half cup peanut butter mixture; set aside. To remaining peanut butter mixture, add water, oil and eggs; blend at low speed until mostened. Beat 2 minutes at high speed. Stir quarter cup of the chocolate chips and quarter cup of the peanut butter chips into batter. Pour batter into greased and floured pan. In small bowl, combine reserved half cup peanut butter mixture, remaining chocolate chips and peanuts. Sprinkle over batter. Bake at 180ºC or 40 to 50 minutes or until toothpick inserted in center comes out clean. Immediately sprinkle with remaining peanut butter chips; gently press into top of cake. Exchanges: 3 starch, -20ºC at. ----