Open-Faced Croque Monsieur


The Croque Monsieur is a decadent take on the ham-and-cheese sandwich, and this open-faced version is easy to make.

Open-Faced Croque Monsieur
Photo: Marcus Nilsson
Hands On Time:
20 mins
Total Time:
20 mins
4 serves


  • 1 tablespoon unsalted butter

  • 1 tablespoon all-purpose flour

  • 1 cup warm milk

  • Kosher salt and black pepper

  • Pinch nutmeg

  • 1 cup grated Gruyère

  • 8 ounces thick country-style or whole-grain bread, crusts removed

  • 3 tablespoons Dijon mustard

  • 6 ounces ham, thinly sliced

  • cup finely grated Parmesan


  1. Melt the butter over low heat in a small saucepan. Add the flour, stirring with a wooden spoon until it smells nutty and is slightly browned, about 2 minutes. Slowly pour the milk into the pot and cook, whisking, until the sauce is thickened. Remove from heat and stir in 1 teaspoon salt, 1/2 teaspoon pepper, the nutmeg, and Gruyère until the cheese is melted.

  2. Heat broiler to high with the rack 6 inches from the flame. Place the bread on a baking sheet. Lightly brush half the bread with mustard and layer on the ham. Spoon the cheese sauce over the bread and sprinkle with the Parmesan. Broil until the sauce is bubbly and lightly browned, 2 to 3 minutes. Serve warm.

Chef's Notes

Nutrition Facts (per serving)

420 Calories
19g Fat
32g Carbs
27g Protein
Nutrition Facts
Calories 420
% Daily Value *
Total Fat 19g 24%
Cholesterol 70mg 23%
Sodium 1820mg 79%
Total Carbohydrate 32g 12%
Protein 27g
Calcium 459mg 35%
Iron 2mg 11%

*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

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