croque monsieur pie

Name: croque monsieur pie
Cuisine: European, Mediterranean, French
Ingredients: 3 tablespoons butter,; plus more for greasing; 12 thin slices stale or fresh white bread,; crusts trimmed (1/2- to 3/4-inch thick); 12 thin slices mild ham; 2 round Tablespoons flour; 2 cups whole milk; Freshly grated nutmeg; Salt and pepper; Dijon; mustard,; plus more for serving; I prefer to use 1 Tablespoons Dijon; 3 large eggs; 8 ounces Gruyere or Swiss cheese, shredded (about 2 cups); Finely chopped fresh parsley,; Mixed greens dressed with lemon juice and vinegar,