1 Betty Crocker super moist yellow cake mix
1/2 c. firmly packed brown sugar
1 c. peanut butter

Mix cake mix, sugar, and peanut butter on low speed of mixer until crumbly. Reserve 2/3 cup of this mixture for topping. To rest of mixture, add: 1/4 cup oil, 3 eggs, and 1 cup water. Beat and pour batter into 13 x 9 inch greased baking dish. Top with reserved topping mixture and sprinkle with chocolate chips and nuts, if desired. Bake at 350 degrees until done.