Peel potatoes and cut into 1-inch chunks. Place in a large stockpot and add enough water to cover potatoes. Add a pinch of salt, cover, and heat to boiling.
Once boiling, reduce heat slightly and let simmer until potatoes are tender but not falling apart, 15-20 minutes.
Meanwhile, in a small saucepan combine cream, butter, and garlic. Heat over medium, stirring to melt butter. Once melted and warmed through, reduce heat to low.
Drain potatoes, then return to the hot pot to evaporate any excess water. Transfer to a large bowl and mash.
Pour the cream mixture over the potatoes and fold potatoes to mix, making sure to not stir vigorously.