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Preheat oven to 350 degrees F. Line a 9x13 baking dish with parchment paper.
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Mix 1 3/4 cups flour, 1/2 cup powdered sugar, and softened butter until a crumbly dough forms. Press evenly into the bottom of the dish.
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Bake the crust for 20 minutes until light golden.
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While the crust bakes, whisk together eggs, granulated sugar, remaining 1/4 cup flour, lemon juice, lemon zest, and salt until smooth.
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Pour the lemon filling over the hot crust immediately out of the oven.
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Return to the oven and bake for 22 to 25 minutes until the filling is set and no longer jiggles in the center.
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Cool completely at room temperature, then refrigerate for at least 1 hour until firm. Dust generously with powdered sugar before cutting into bars.