Recipe is from wearenotmartha.com
Cream together butter and sugar using the paddle attachment of an electric mixer (you could use a hand blender if you need, too!). Beat until smooth. Then add in the egg and vanilla and beat until incorporated and smooth. Turn the mixer to low and add in the salt and flour. Mix until well incorporated. Shape dough into a cylinder with a diameter of about 2-3 inches. Then wrap this dough in parchment paper (which was a bit awkward) and put it in the freezer for at least 25 minutes. (there are so many that’s what she saids in my head right now, it’s not even funny).
Go to wearenotmartha.com for an illustrated version of the recipe.