Peanut Butter Crunch Cake

This is a recipe from Aunt Eileen.

1 pkg super moist yellow cake mix
1/2 c packed brown sugar
1 cup peanut butter
1 cup water
1/4 cup vegetable oil
3 eggs
1/3 cup chopped peanuts
1 cup chocolate chips
Heat oven to 350. Grease 13x9 pan. Beat cake mix dry, brown sugar, and peanut butter on low speed until crumbly. Reserve 2/3 cup of the crumbly mixture. Beat remaining crumbly mixture, water, oil and eggs on low speed, scraping bowl frequently, 2 minutes. Pour batter into pan. Stir nuts into reserved crumbly mixture; sprinkle over batter. Sprinkle with chocolate chips. Bake until cake springs back when touched lightly in the center. 40-45 minutes.