Cut your potatoes into about 1 inch sized cubes. Place the potatoes in a large pot. Fill the pot with cool water to cover the potatoes by about 1 inch.
Place the pot on a stove burner set to high heat, and bring the water up to a boil. Boil the potatoes for about 20 minutes, or until fully cooked. To test the doneness, you should be able to insert a knife into the center of a potato without resistance.
Drain the potatoes, and transfer to a heatproof bowl. Mash the potatoes using a fork, potato masher, or potato ricer until they're smooth. Take care not to over mash!
Add the milk, butter, salt and pepper to the potatoes. Mix together until all of the ingredients are evenly blended. Serve plain or top with some fresh chopped parsley, melted butter, olive oil, and/or black pepper.