Fluffy Roasted Garlic Mashed Potatoes Ingredients 8 Russet potatoes, about 4 pounds 1 head fresh garlic 1 tablespoon olive oil 1/2 teaspoon kosher salt 1 teaspoon lemon thyme, finely chopped 4 tablespoons butter 1 cup crème fraîche 3/4 cup heavy cream, as needed 1 tablespoon lemon juice, freshly squeezed 1 teaspoon lemon zest, freshly grated