01 - Place potato chunks into a large pot and cover with cold water seasoned with salt.
02 - Bring water to a boil over medium-high heat, then reduce heat to a simmer and cook until potatoes are fork-tender, approximately 15 to 18 minutes.
03 - Drain the potatoes thoroughly and return them to the hot pot. Let rest for 1 to 2 minutes to evaporate excess moisture.
04 - Add cubed butter, warm milk, and cream to the potatoes and mash using a potato masher or ricer until smooth and creamy.
05 - Incorporate salt and black pepper, then taste and adjust seasonings as preferred.
06 - Serve immediately, optionally garnished with extra butter or chopped chives.