01 -
Peel Yukon Gold potatoes and cut into uniform 2-inch pieces for even cooking.
02 -
Place potatoes in a large saucepan and cover with cold water. Add 1 teaspoon of salt to the water. Bring to a boil over high heat, then reduce to a simmer. Cook for 15 to 20 minutes until potatoes are fork-tender.
03 -
Drain potatoes thoroughly in a colander. Allow them to steam dry for 2 to 3 minutes to remove surface moisture.
04 -
Return potatoes to the warm pot or transfer to a mixing bowl. Mash with a potato masher or ricer until mostly smooth, leaving some texture if preferred.
05 -
Immediately add the softened butter, stirring until melted and fully combined. Add Boursin cheese and warm milk, mixing gently until smooth and homogeneous.
06 -
Fold in sour cream if desired for added richness. Season with fresh ground black pepper and additional salt to taste.
07 -
Taste and adjust seasoning as needed. For silkier potatoes, add a splash more warm milk. For more pronounced flavor, stir in extra Boursin cheese to preference.
08 -
Transfer mashed potatoes to a serving bowl. Top with chopped chives or parsley and an extra pat of butter if desired. Serve hot.