Lemon Squares

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Crust:

1 cup (2 sticks) butter, at room temperature 

2 cups all-purpose flour 

1/2 cup confectioners' sugar, plus more for sprinkling

Filling:

4 large eggs 

5 tablespoons fresh lemon juice (from about 2 large lemons) 

2 tablespoons grated lemon zest 

2 cups granulated sugar 

1 tablespoon all-purpose flour 

1 teaspoon baking powder 

1/2 teaspoon salt