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Set oven to 350.
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Place the marshmallows at the bottom of a 9x13 pan.
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Make the cake mix per box instructions.
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Pour half of the cake batter over the layer of marshmallows.
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Spoon the pie filling over the cake mix.
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Spoon second half of cake batter on top.
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Bake 20-25 minutes until cake appears cooked.
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Let Cool
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Spread Cool Whip over the top of cooled cake, refrigerate or eat immediately.