After peeling and cutting the potatoes, put them in a large enough sauce pan and fill with water just until potatoes are covered. Salt the water with regular salt and cover. Place over high heat for 30 minutes. (If it starts to boil over through the lid, lower the heat slightly). Drain potatoes, and place them back into the sauce pan or in a seperate serving/mixing bowl. Smash them up with a potato masher, fork, or an electric beater (without turning it on this time only) Add the butter and mix with the electric beater After more or less mixed, add the milk and continue until it becomes smooth (you can add more milk according to how smooth you'd like the potatoes to be) Add garlic salt and pepper according to taste, and also add cheese. Then mix with a wooden spoon. (So the cheese is visible in presentation)