Let's whip it up
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A prepared brownie mix becomes amazing layered bars when you add OREO Cookies, peanut butter frosting, marshmallows and nuts.
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Heat oven to 350°F.
Line 13x9-inch pan with foil, with ends of foil extending over sides. Spray with cooking spray. Place 24 cookies, in 6 rows of 4 cookies each, on bottom of prepared pan. Chop remaining cookies; reserve for later use.
Prepare brownie batter as directed on package; pour over cookies in pan, completely covering cookies.
Bake 25 to 30 min. or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.) Cool completely.
Beat peanut butter and butter in large bowl with mixer until blended. Gradually beat in sugar; spread over brownie. Top with marshmallows, nuts and reserved chopped cookies.
Refrigerate 1 hour.
Use foil handles to remove brownie from pan before cutting into bars.
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