Step 1

Preheat the oven to 350 degrees.

Step 2

Dice the potatoes into even-sized pieces and boil in a pot of water until fork-tender, about 25 to 30 minutes.

Step 3

Drain and return to the pan over low heat. Mash potatoes for about 5 minutes.

Step 4

Add the butter, mascarpone, half and half, cream, pepper, and roasted garlic. Stir until all ingredients are equally distributed throughout and you have achieved your desired consistency.

Step 5

Spread the potatoes into a large baking dish that has been coated with nonstick spray. Dot the top with additional unsalted butter (optional). Bake until heated through, about 30 minutes.