If your grill does not come with inserts, you can still use it.

Add ham with the cheese to give more taste to your sandwich. Vary the breads and cheeses to make it more interesting. For example, try goat cheese on whole grain bread. Place a thin slice of tomato on the cheese, and grill it together. Be careful not to burn your mouth, though, since cooked tomatoes become very hot due to their high percentage of water. Add fruits or veggies. Examples are grilled goat cheese with apples or the classic grilled cheese with tomato.