In large pot of water, boil the potatoes until a fork can be inserted and removed easily from the potatoes. About 10 minutes. Drain well.
Return the potatoes to the pot add roasted garlic, half and half, butter and salt and pepper. Mash until potatoes are your desired consistency.
Notes
A potato masher is the best way to mash these potatoes (as opposed to a mixer) because when red potatoes are overworked they will become gummy. Can be made in advance and reheated before serving. You may need to add a bit more half and half. Nutrition information for estimation purposes only.