BAKE 27 to 30 min. or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.) Immediately top with semi-sweet chocolate and spoonfuls of peanut butter. Let stand 3 to 4 min. or until chocolate is melted; swirl gently with spoon. Cool completely. Refrigerate at least 30 min. before cutting to serve.
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