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Preheat & Prepare
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Preheat oven to 350°F (175°C).
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Lightly grease a 9×13 inch baking pan or line with parchment paper.
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Make the Base
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In a bowl, combine cake mix, melted butter, and egg.
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Mix until a thick dough forms.
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Press evenly into the bottom of the prepared pan.
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Prepare the Creamy Layer
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Beat the cream cheese until smooth.
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Add eggs and vanilla; mix until fully combined.
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Slowly mix in melted butter.
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Gradually add powdered sugar and beat until smooth and creamy.
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Assemble
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Pour the cream cheese mixture over the base.
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Spread gently to cover evenly.
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Bake
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Bake for 40–45 minutes.
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The center should still be slightly soft and jiggly — do not overbake.
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Cool & Slice
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Allow bars to cool completely before cutting.
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Dust with powdered sugar if desired.
