Preheat the oven to 350°F (175°C) and line two baking sheets with parchment.

Cream the butter and sugar until light and fluffy, about 2 minutes.

Beat in the egg and vanilla until just combined.

Gradually mix in the flour and salt until a dough forms, being careful not to overmix.

Roll the dough to 1/4-inch thickness on a floured surface, cut into shapes, and place on the prepared sheets. For sharp edges, chill the cutouts on the sheet for 5 minutes in the freezer.

Bake for 10 to 12 minutes until the edges are lightly golden. Cool on the sheet for 5 minutes, then transfer to a wire rack. Decorate once completely cooled.