Heat the oven to 400ºF (200°C). Cut the garlic in halves, pour olive oil, and bake for 12 minutes, until soft and browned.
1 head garlic, 1 teaspoon extra virgin olive oil
In the meantime, peel and boil the potatoes for 20-25 minutes, until the potatoes are fork tender.
4 pounds potatoes
Drain the potatoes. Pass the potatoes and roasted garlic cloves through a potato ricer, or mash them directly in the pot with a potato masher.
Add the heavy cream, milk, thyme, butter, salt and pepper.
2 cups heavy cream, 2 cups whole milk, 3 sprigs fresh thyme, 6 tablespoons salted butter, Salt and black pepper
Brown the butter in a small skillet at medium - you just have to bring it past the melting stage for 2-3 minutes, as soon as it starts to get brown, remove it from the skillet.
3 tablespoons butter
Serve the mashed potatoes with the browned butter, fresh pepper, and thyme.