Preheat oven to 350. Cream butter, sugar, eggs, and vanilla one at a time.
Combine flour, baking powder, and salt.
Slowly in batches mix dry ingredients with wet ingredients.
Now for the main event!
Chop mints and add to dough.
Chill for 1 hour!! Also chill your rolling pin in the freezer, works wonders.
Roll 1/4 inch thick, use candy cane shaped cookie cutter.
Place cookies on lines cookie sheet. Bake 8-10 minutes.