Place the potatoes in a large pot and add 1 tablespoon of salt. Pour enough water into the pot to cover the potatoes by about 10 cm (4 inches).
Bring the pot to a boil over high heat, then lower the temperature to maintain a rapid simmer. Allow the potatoes to cook for about 15 minutes, or until they’re exceptionally tender and fall apart easily when pierced with a fork.
Drain the potatoes thoroughly, then return them to the pot. Let them sit for about a minute, shaking the pot intermittently to help any remaining water evaporate.
Add the butter, warm milk, and salt, then mash until smooth and creamy. Adjust the milk to reach your preferred consistency.
Important Note: Avoid using electric mixers or food processors, as these can make the potatoes gluey. If using a stand mixer or handheld mixer, pulse gently and stop as soon as the potatoes are creamy.
Transfer the mashed potatoes to a serving dish, creating decorative swirls on the surface. Drizzle melted butter over the top and sprinkle with chopped chives or parsley for garnish. Serve hot and enjoy!