With a mixer in a large bowl, cream the butter until fluffy (2-3 minutes). Scrape down the sides of the bowl with a rubber spatula, add sugar, and continue beating until light, 2 to 3 minutes. Scrape the sides of the bowl again, if needed, then add the egg mixture, beating for about 1 minute. Sift the salt with the flour. Reduce the mixer to a low speed and then add the flour mixture, mixing just until blended.
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Turn the dough out of the bowl. Divide the dough in half and place each half between 2 pieces of lightly floured parchment or waxed paper. Use a rolling pin to flatten the dough into a disk about 1/4-inch thick. Slide the dough/parchment sheet onto a flat cookie sheet, or on the back of a rimmed baking sheet. Refrigerate until firm, about 2 hours.
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