Bring a large pot of salted water to a boil.
Add the potatoes and cover. Simmer until potatoes are fork tender, about 20 to 30 minutes. Remove from heat and drain.
Return the potatoes to the pot and add cream cheese, sour cream, and garlic salt. Using a potato masher, mash the mixture together until creamy. Salt and pepper to taste.
Spoon into a serving bowl and garnish with melted butter and parsley