- Preheat oven to 450°F. 
- Using a mandolin, slice potatoes into 3mm rounds. 
- Add potatoes, truffle oil, and truffle salt to a large bowl, mix until well combined. 
- Add 1 teaspoon of truffle oil to a medium cast iron skillet. 
- Assemble galette by layering potato slices in three rings covering the bottom of the pan. 
- Continue arranging potatoes until you have three layers of rings. 
- Add skillet to oven and bake for 20 minutes. 
- Check galette after 20 minutes, if the top is brown cover it with foil and cook for an additional 5 minutes, if it needs to brown more cook for an additional 5 minutes uncovered. 
- Remove from oven, loosen edges with a spatula and flip onto a serving plate.