There’s nothing more comforting than a bowl of gratinéed onion soup, with its slowly caramelized onions, rich and flavorful broth, and a layer of crusty bread topped with melted cheddar. This timeless classic, perfect for chilly days, is made with simple and affordable ingredients, yet its intense, comforting flavor is sure to impress. Whether you enjoy it with a glass of wine or serve it as an appetizer, this gratinéed onion soup is a guaranteed hit!