"Watch it disappear...."
INGREDIENTS
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16 ounces cream cheese, at room temperature
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10 tablespoons (1 1/4 sticks) unsalted butter, melted, plus more for the baking dish
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1 (13.25- to 15.25-ounce) box yellow, butter, or lemon cake mix
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1 (21-ounce) can lemon pie filling, divided
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1 large egg
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1/2 cup powdered sugar
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1/2 teaspoon kosher salt
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Whipped cream or vanilla ice cream, for serving (optional)