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Preheat oven to 350 degrees.
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Line a 9x13 in pan with parchment paper, or spray with nonstick cooking spray.
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Mix butter and sugar until pale and fluffy.
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Add egg yolks and vanilla, mix until combined.
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Slowly add flour and salt until everything is mixed together.
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Bake until the edges are golden, about 12-14 minutes.
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Cool completely before frosting.