Turkey Croque Monsieur or Croque Madame - A delicious twist on the classic French sandwich. The perfect way to use up Thanksgiving leftovers too. A cheesy Ham and cheese sandwich with cranberry mustard sauce and Turkey, slathered in Bechamel Sauce.
Warm the milk (and gravy, if using) in a saucepan or microwave until it starts to boil. Set aside.
Place the cranberry sauce in a bowl and mix in the mustard. Set aside. The grated gruyere cheese will be used inside the sandwich as well as outside, so divide the cheese in to roughly 8 portions.
Butter both sides of each slice of bread. On one slice, place 2 slices of ham, a layer of turkey, a generous spread of cranberry mustard sauce. Top with grated gruyere cheese, and then with a buttered slice of bread.
OPTIONAL - you can add a thin layer of bechamel sauce inside the sandwich too.
Grill the sandwiches on both sides in a pan or on a griddle over medium - medium high heat, until the cheese has melted and the bread is golden brown - about 4 minutes per side for me.
Top each sandwich GENEROUSLY with the cheesy bechamel sauce - make sure the entire surface is covered from edge to edge. Top with the remaining gruyere cheese.
Broil in the oven for a few minutes, until the cheese has melted and you can see caramelized spots on the surface.
Remove from the oven and serve immediately. Top with sunny side up (or poached) eggs for a turkey croque madame.