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Place the butter in an 8-in square glass pan.
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Cover and microwave on high until melted, about 1 minute.
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Stir in graham cracker crumbs and sugar.
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Press firmly onto the bottom of the dish.
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Cover and microwave on high 1-1/2 minutes.
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Cool 5 minutes.
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In a bowl, combine 1 cup coconut, sweetened condensed milk and nuts.
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Spoon over the crust.
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Microwave uncovered on high for 1 minute.
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Rotate dish a half turn and microwave 1 minute more until heated through.
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In a small microwave safe bowl, combine chips and shortening.
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Microwave uncovered about 1 minute, check to see if the chocolate is melting smoothly, you may need to melt an additional 30-45 seconds.
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Quickly pour over the coconut mixture Spread evenly.
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Toast remaining coconut if desired sprinkle over the top.
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Cool completely.