Step 1

Preheat oven to 350 degrees F. Line two baking sheeting with parchment paper or silicone baking mats.

Step 2

Beat the butter and sugar on medium speed until combined and fluffy, 1 to 2 minutes. Add the salt, vanilla and egg, and beat until combined, about 1 minutes. Reduce the speed to low and gradually add the flour until mostly combined. Give a final few stirs with a rubber spatula to ensure the flour is totally incorporated (the dough will be thick).

Step 3

Transfer the dough to a decorating bag fitted with a large open star tip. Pipe the dough into 2-inch circles on the parchment paper or silicone baking mats. Sprinkle with sugar.

Step 4

Bake, one pan at a time, until light golden brown, 15 to 17 minutes. Allow to cool completely before storing or serving.