Croque Monsieur
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Croque monsieur is a classic French sandwich. This recipe appears in "<a href="/features/martha-stewarts-cooking-school-french-bistro-classics-episode/">Martha Stewart's Cooking School</a>."

Ingredients
Instructions
1 Preheat oven to 400 degrees.
2 Melt butter in a saucepan over medium heat. Add flour and cook, stirring with a wooden spoon for 2 minutes. Increase heat to medium-high, and slowly add hot milk. Cook, whisking constantly, until thickened, 5 to 6 minutes. Remove pan from heat, and add salt, pepper, nutmeg, and 1/2 cup Gruyere. Set bechamel sauce aside.
3 Lightly brush 4 slices bread with mustard. Divide ham evenly between bread, and sprinkle each with 2 tablespoons Gruyere. Top with 4 more slices toasted bread. Slather tops with the bechamel sauce, and sprinkle with remaining Gruyere and herbes de Provence.
4 Bake sandwiches until topping is lightly browned, 12 to 15 minutes. Serve hot with cornichons.