My Favourite Sugar Cookies

Directions

1. 1
   Combine cookie mix, egg, egg yolk, and vanilla in a small bowl.
2. 2
   Cover; chill until firm, about 3 hours.
3. 3
   Divide dough in half; roll each half to desired thickness on a lightly floured surface.
4. 4
   Cut into desired shapes; brush with egg white.
5. 5
   Place on a greased cookie sheet.
6. 6
   Bake at 375F (190C) for 8 to 10 minutes or until lightly browned.
7. 7
   (Cookies spread considerably during baking.)
8. 8
   Remove from cookie sheet.
9. 9
   Decorate if desired.