For Croque Monsieur: Spread each slice of bread with butter. Trim cheese so it is a tad smaller than the bread slices. Arrange 2 slices of cheese, top with bread and dip both sides of each sandwich in egg.
In a skillet heat butter and brown the sandwich on each side for 3 minutes or until golden.
For croque Madame: Wedge a slice of Black Forest ham in between each slice of cheese.