Super Spritz Cookies

Directions

1. 1
   With electric mixer at high speed, cream butter until soft. Add sugar gradually, continuing to cream about 5 minutes until light and fluffy.
2. 2
   Add egg yolks and vanilla; beat well.
3. 3
   Add flour in 3 additions; mix well by hand or with electric mixer after each addition; dough will be stiff.
4. 4
   Shape dough into 2 rolls; wrap in waxed paper and refrigerate at least 1 hour.
5. 5
   Put in electric cookie maker or put by spoonfuls on cookie sheet. Sprinkle with colored sugar if desired.
6. 6
   Bake for 7 to 10 minutes at 400° or until just starting to turn light golden around edges, being careful not to overbake.