Mashed potatoes may be the world's consummate comfort food, but this truffle mash manages to crank the dial up to eleven. Blend yukon gold potatoes to a velvety consistency along with heavy cream, sour cream, butter, cream cheese, and—because that isn’t luxurious enough—a decadent drizzle of truffle oil. Top with chives and indulge yourself; the only guilt you'll feel is for refusing to share.