"Meet your new favorite mashed potato recipe...."
3 to 4 heads garlic
olive oil
plus 1/2 teaspoon kosher salt
Black pepper, to taste
russet or Yukon Gold potatoes, peeled and cut into 1-inch chunks
sticks salted butter, cut into pieces and at room temperature, plus more for topping
cream cheese, at room temperature
grated parmesan cheese
half-and-half
heavy cream
fresh parsley, chopped, plus more for topping