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Preheat the oven to 350º.
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Prepare cake batter according to the box directions. Set aside.
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Place strawberries in a greased 9×13 baking dish.
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Evenly sprinkle dry jello mix over top of strawberries.
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Next, add marshmallows.
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Finally, pour the cake batter over top.
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Bake for 50 minutes or until a toothpick comes out clean.
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Allow cake to cool for 20 minutes. Then gently run a knife around the edges and flip the cake out onto a serving tray.