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Preheat oven to 350 degrees.
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In 13x9 inch pan, melt butter or margarine in oven.
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Sprinkle graham cracker crumbs over melted butter, then coconut.
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Pour sweet condensed milk evenly over coconut.
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Bake for 25 minutes or until lightly browned.
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In small pan, melt half of the chocolate chips and peanut butter over low heat. Then add remaining chocolate chips and fully melt.
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Spread evenly over coconut layer.
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Cool, then refrigerate for 2-3 hours to fully harden.
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Cut into bars and store covered at room temperature.