Cream butter then add sugar, salt and vanilla until light and fluffy.
Add egg until fully incorporated. Scrape down sides, if needed.
Sift together flour and add to butter mixture.
Add milk and blend until smooth.
Work dough on a floured table. Chill until needed - about 1-2 hours.
Roll out chilled dough to about ¼ inch. Use the tart ring to cut out the base and a pizza cutter to cut strips for the sides. Press evenly into tart rings and place on a baking sheet lined with a silicone mat.
Use a fork to punch holes in the bottom of the shell.
Place in the refrigerator to chill for an additional hour.
Preheat oven to 350ºF.
Bake until golden brown, about 15 - 20 minutes depending on your oven.