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Preheat oven to 350, grease 13 x 9 inch baking pan.
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Place graham crackers in food processor or blender works fine too.
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Process until crackers form fine crumbs.
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Measure 2 cups of crumbs.
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Combine graham cracker crumbs, chips, coconut and walnuts in medium bowl; stir to blend.
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Add milk; stir until blended.
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Spread batter evenly in prepared pan.
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Bake 15-18 minutes or until edges are golden brown.
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Cool completely before cutting.
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Cut into bars.
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Store tightly covered at room temperature.
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These freeze very well too!