Peel and quarter potatoes. Place in large pot and cover with cold water. Bring to a boil over high heat. Once they boil, turn heat down to medium-high to gently boil. When potatoes are fork tender, about 15-20 minutes, drain off water. Return potatoes to pan.
In a small saucepan, melt butter over low heat. Add cream. Sprinkle in the garlic powder, salt and pepper.
Add cream mixture to potatoes. Beat with mixer on high until potatoes are mashed and smooth.