Line 2 baking sheets with parchment. Using an electric mixer, beat the butter, granulated sugar, and zest on medium-high until light and fluffy, 2 to 3 minutes. Beat in the egg, then the vanilla and salt.
Reduce mixer speed to low and gradually add the flour, mixing until just combined (do not over mix). Shape into a 1-inch-thick disk, wrap in plastic wrap, and refrigerate for at least 2 hours and up to 3 days.
Heat oven to 350° F. On a floured surface, roll the dough ¼ inch thick. Using lightly floured 2- to 3-inch cookie cutters, cut the dough into shapes, flouring the cutters and rerolling the scraps as necessary. Place the cookies 1 inch apart on the prepared baking sheets. Sprinkle with decorating sugar, if using.
Bake the cookies, rotating the baking sheets halfway through, until the edges just begin to brown, 12 to 15 minutes. Let cool slightly on the baking sheets, then transfer to a wire rack to cool completely.
Culinary pleasure and entertaining with friends and family refreshes the soul, revives the spirit and makes new memories.
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