"You won't believe how easy it is...."
INGREDIENTS
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1 (15.25-ounce) box strawberry cake mix, such as Pillsbury
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1 large egg
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1/3 cup vegetable oil
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1/4 cup water
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4 ounces cream cheese
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2 tablespoons unsalted butter
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1 3/4 cups powdered sugar
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1/4 teaspoon vanilla extract
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Pinch kosher salt
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Sprinkles (optional)