Peel the potatoes and cut them into ¾” thick slices (or 1" cubes).
Add the sliced potatoes to a large pot filled with water.
Bring to a boil over high heat. Once a boil is reached, cook for 18-23 minutes, or until the pieces are easily pierced with a knife.
Drain the potatoes in a colander set over the sink. Turn off the heat.
Return the potatoes to the pot, along with the butter.
Place the pot back over the residual heat, and mash with a potato masher until they are broken down and the butter is melted.
Remove from the heat and add the Boursin, heavy cream, salt, and pepper. Mash and mix well until smooth (with either a silicone spatula or an electric mixer).
Taste and adjust seasonings and add salt, pepper, and butter to your taste.
Serve with additional butter and minced chives (optional).
Notes
Storing: Transfer any leftover mashed potatoes to an airtight container and store them in the refrigerator for up to 3 days.Reheating: Heat in the microwave in 90-second intervals until heated through. Instant Pot: Cook the potato slices for 8 minutes (or 6 minutes for cubes). Drain and return the potatoes to the pot. Mash with the butter using the "saute" function. Turn off, then add the remaining ingredients and mix well. Serve and enjoy!