Croque Monsier sandwich

There are many different recipes for making “Croque Monsieur” sandwiches (literally “Mister Crunchy”, ranging from a simple toasted ham and cheese sandwich (such as this one), to sandwiches requiring a special shell-shaped press, to sandwiches topped with Mornay sauce and broiled. Croque Monsieur sandwiches are a favorite mid-mountain treat for us on our annual family ski trip, so I thought it would be fun to make them at home, too.
This version is very simple (you don’t even need a recipe, really), kid-friendly and VERY delicious. I used wheat bread, instead of white, because that’s just what we always keep around.