PREP: Wash and peel and potatoes, and cut them into 1 ½ inch cubes. Rinse potato chunks with cold water until the water runs clear.
BOIL: Add potatoes to a large pot with 1 tablespoon of salt and cover with water by about 2 inches. Bring up to a boil and cook for about 15 minutes until fork tender. Drain potatoes and rinse with hot water.
MASH: Mash the potatoes through a potato ricer while still warm, and add them back to the pot. You can also do this with a potato masher if you want a chunkier mashed potato.
MIX: Add in butter, Boursin, and warm cream. Start with 1 cup of cream, then add more if needed. Gently fold in ingredients until incorporated. Add salt and pepper to taste.
SERVE: Serve hot. Option to top with fresh herbs, melted butter, or gravy.
