INGREDIENTS
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cooking spray
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2 cups frozen peach slices
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2 cups mixed frozen berries
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2 tablespoons cornstarch
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1 teaspoon vanilla extract
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1/2 cup brown sugar
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1/2 teaspoon ground cinnamon
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1/2 teaspoon nutmeg
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1 (18.25 ounce) package white cake mix
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1/2 cup melted butter