In a large mixing bowl, beat two sticks of butter until creamy. Add 1/2 C granulated sugar and all of powdered sugar and salt; beat 1 minute. Add egg yolks and vanilla. Mix until combined. Add flour. Mix only until mixture comes together. Do not overmix. Dough will be crumbled, yet soft.

Roll dough into a log on plastic wrap. (Use a cardboard paper towel roll cut lengthwise to form dough into log.) Refrigerate for 3 hours, or freeze for one hour, until firm.

When ready to bake, preheat oven to 350 degrees F. Remove dough from refrigerator, unroll dough log and slice at ½” intervals. Place cookies 2” apart on baking sheet. Sprinkle each unbaked cookie lightly with remaining 1/4 C granulated sugar.

Bake in a 350 degree F oven for 15 minutes. Cool. Makes 3-4 dozen cookies depending on size and thickness of dough log and slice of cookies.