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Pour the crushed graham crackers into a 9x13 pan and spread evenly over the bottom.
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Mix the melted butter, powdered sugar, and milk or cream and pour over the graham crackers. Sprinkle with walnuts if desired.
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Slice the peaches and put in the pan, making sure to add all the juices.
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Spread whipped topping over the top.
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Garnish with extra crushed graham cracker or chopped nuts if desired.
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Refrigerate until ready to eat.