Start by giving your potatoes a good scrub under cold water. If you're in the mood for a more rustic mash with a bit of texture, feel free to leave the skins on some or all of the potatoes. Peel them for that classic smooth experience. Cut the potatoes into even thirds.
Fill a large pot with cold water, add a pinch of salt, and bring it to a boil. Carefully add your potato pieces to the pot. Let them simmer away until they're tender enough to be easily pierced with a knife (about 15-20 minutes).
In a small saucepan, combine the heavy cream, butter, minced garlic, salt, and a generous sprinkle of pepper. Warm over low heat, stirring occasionally. You garlic needs infuse well.
Once your potatoes are cooked, drain them well and return them to the pot. Pour the warm, garlicky cream mixture over the potatoes and start mashing. Mash to your desired consistency (do not overcook).