Sprinkle marshmallows into a Pam sprayed 13 x 9 x 2 inch baking pan. In a large mixing bowl, combine the cake mix, water, peanut butter, oil and eggs; beat on low speed for 30 seconds. Beat on medium for 2 minutes or until smooth. Pour over marshmallows; sprinkle with chocolate chips. Bake at 350 degrees for 30-35 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack.
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