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Preheat oven to 375°
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Grease the sides and bottom of a 9" square baking pan.
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Place graham crackers in a gallon zippy bag and crush with a rolling pin.
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Beat together the butter and brown sugar until fluffy.
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In a separate mixing bowl, mix together the flour and the graham cracker crumbs.
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Combine the wet and dry ingredients to make the crust.
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Spread the crust in the bottom of the prepared baking pan.
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Sprinkle the marshmallows and chocolate chips on top of the crust.
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Bake for 10-12 minutes at 375°-until marshmallows are golden brown.