Prepare and bake brownie mix in a greased 13"x9" baking pan according to package directions. Let cool. Mix powdered sugar, 1/2 cup butter and peanut butter. Mix well and spread over cooled brownies. Chill for one hour. Melt together chocolate chips and remaining butter in a saucepan over low heat, stirring occasionally until melted. Spread over brownies. Let cool; cut into squares. Makes 2 to 3 dozen.
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