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Line 9x13 casserole pan with whole graham crackers end to end covering bottom of pan.
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In a medium sauce pan bring to a boil butter, sugar, milk and egg.
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Boil for one minute stirring constantly.
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Remove from heat, add walnuts and graham cracker crumbs.
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Spread mixture over whole graham crackers; cool in fridge 30-45 minutes.
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FROSTING:.
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Mix butter, powdered sugar and vanilla with electric mixer on low speed.
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Add milk to mixture 1 TBS at a time until you get a spreadable consistancy.
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Spread over filling and refrigerate at least one hour before serving.
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*NOTE: For a chocolate filling add 3 TBS cocoa powder with the graham cracker crumbs. Can also sprinkle chocolate chips on top of frosting.*.