Thin, crisp 'cat's tongue' butter cookies are delicate and elegant. These refined mediterranean biscuits are a family favorite alongside coffee and gelato.
Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper to keep the cookies from sticking.
Cream the unsalted butter and powdered sugar together in a medium bowl until light and fluffy, ensuring smooth texture.
Add the eggs one at a time, mixing on low speed for even incorporation, then blend in the vanilla extract and salt thoroughly.
Gradually fold in the all-purpose flour just until combined; do not overmix to maintain a delicate crumb.
Transfer batter to a piping bag with a 1/2-inch round tip and pipe thin lines (about 3 inches long) onto the sheet, spacing them apart to allow spread.
Bake for 10–12 minutes, rotating the pan halfway through baking for even color, until edges turn pale golden, not brown.
Cool on the baking sheet for 2 minutes, then carefully transfer to a wire rack to finish crisping up.