Wash and prep your potatoes. I just cut off the large eyes and quartered mine. You can peel them if you like. Depending on the size, I would either cut them in half or quarter them.
Add the potatoes to the water with 1 ½ tablespoons salt.
Bring to a boil over high heat, then reduce the heat and simmer until the potatoes are tender.
Drain them quickly, you don't want to leave them in the water too long. Also, only let them drain for about 30 seconds, you still want a little over the boiling water with them.
Add them, Boursin, butter, ½ cup milk, 1 teaspoon salt, pepper, and garlic to a large bowl or stand mixer. Mix them on high for about 1 minute. Check for consistency, add more milk as needed. Also, check for salt and pepper and add more if needed.
Whip the potatoes on high for about 2-3 minutes.
Top with a little more melted butter and parsley if you are using it.
That is it! The potatoes are done and ready to be enjoyed.