Bacon and Onion Croque Monsieur is a delicious twist on the classic French sandwich. This recipe combines crispy bacon, caramelized onions, and melted cheese between two slices of buttery toasted bread. The bacon adds a smoky and savory flavor, while the onions bring a touch of sweetness. The melted cheese holds everything together and adds a creamy richness. This Croque Monsieur is perfect for a quick and satisfying lunch or dinner.