Preheat the oven to 400. Pierce the skin of each potato a few times with a fork. Bake the potatoes for 60 minutes. Let cool.

Cut potatoes in half and scoop the insides out into a bowl. Discard the skins. Add the melted butter, pressed garlic, 1/2 of the half and half and 1 cup of Parmesan cheese to the bowl. Mash with a potato masher until smooth or whisk with a hand mixer. Add the remaining half and half as needed until the potatoes reach your desired consistency. Season with salt and pepper .

Spray a casserole dish with nonstick spray. Spoon the potatoes into the dish and spread them out evenly. Sprinkle the remaining half cup of cheese on top of the potatoes. Cut up a tablespoon of cold butter and dot it on the top of the potatoes. Bake at 400 for 15-18 minutes or until the top starts to brown slightly. Serve hot.