Peel and quarter potatoes then rinse in cold water to remove the starch. Add the potatoes to a large pot and fill with water until the water is 2" above the potatoes roughly.
Add the salt to the water and boil uncovered until fork-tender and then rinse again in a large strainer to remove excess starch.
Use a potato ricer to finely mash the potatoes back into the pot.
In a small pot over low heat melt the butter and warm the milk together.
Fold the melted butter mixture into the potatoes mixing only as much as needed to combine. Serve hot.
Notes
Vegan Option:To make vegan mashed potatoes replace the milk with almond milk and the butter with vegan butter.