Croque Monsieur is a classic French grilled ham and cheese sandwich. It is made with layers of ham and Gruyère cheese, sandwiched between slices of crusty bread. The sandwich is then dipped in beaten eggs and pan-fried until golden and crispy. The result is a deliciously cheesy and savory sandwich with a crispy exterior and a gooey interior. It is often served as a quick and satisfying lunch or brunch option.