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Preheat your oven to 350°F (175°C).
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In a medium bowl, combine the cake mix, melted butter, and egg. Mix until smooth and well combined.
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Press the mixture evenly into the bottom of a greased 9×13-inch baking pan. Set aside.
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In a separate large bowl, beat the softened cream cheese until smooth. Add the eggs and beat for 1–2 minutes until creamy.
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Gradually add the powdered sugar, continuing to beat until fully incorporated.
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Pour the cream cheese mixture over the prepared crust, spreading it evenly.
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Bake at 350°F (175°C) for 25–30 minutes, or until set. Be careful not to overbake—you want that signature gooey texture.
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Remove from the oven and allow to cool completely before slicing into bars.
Tips for Perfection
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For extra flavor, sprinkle a handful of chocolate chips or chopped nuts on top before baking.
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Serve chilled for firmer bars, or at room temperature for maximum gooeyness.