1. Preheat oven to 350F.
2. Lightly cream butter.
3. Add in powdered sugar, salt and vanilla extract. Mix until just combined.
4. Add in flour. Mix until 90% combined.
5. Add candied citrus peels. Mix until combined.
6. Plastic wrap dough and shape into a log.
7. Chill for minimum 2 hours. Preferably overnight.
8. Slice cookies into 1/2 inch thickness.
9. Spread cookies evenly on baking sheet and bake for 10 minutes.
10. Let cool and enjoy.