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Combine graham crumbs, sugar and peanut butter and mix well. Blend in the melted butter until well combined. Press the mixture evenly into a 9 x 13 inch pan.
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Melt chocolate chips in microwave or in double boiler. Spread over the peanut butter mixture.
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Chill until just set and cut into bars (these are very hard to cut if the chocolate gets "rock hard".)