Croque Monsieur

The Quintessential French Ham & Cheese Toastie

A Croque Monsieur is not just a ham and cheese sandwich—it’s a Parisian bistro classic, transformed by a luxurious béchamel sauce and gratinéed to golden perfection. It’s rich, decadent, and surprisingly simple to master.

The Authentic Recipe

Ingredients (Serves 2)

For the Béchamel Sauce (the soul of the sandwich):

• 2 tbsp unsalted butter

• 2 tbsp all-purpose flour

• 1 cup whole milk, warmed

• Pinch of freshly grated nutmeg

• Salt and white pepper to taste

• ¼ cup gruyère cheese, grated (optional, for extra richness)

For the Assembly:

• 4 slices good quality white bread (pain de mie or brioche is ideal)

• Dijon mustard (to taste)

• 4-6 slices high-quality baked ham (Parisian-style or Black Forest)

• 1 ½ cups gruyère cheese, grated (comté or emmental also work)

For the Topping:

• A handful of gruyère cheese, grated

• A sprinkle of parmesan cheese (optional)

Step-by-Step Instructions

1. Make the Béchamel:

• In a small saucepan over medium heat, melt the butter. Add the flour and cook, whisking constantly for 1-2 minutes to form a pale roux (do not let it brown).

• Gradually add the warm milk in a steady stream, whisking vigorously to prevent lumps.

• Cook for 3-5 minutes, stirring, until the sauce thickens to a creamy, coat-the-back-of-a-spoon consistency.

• Remove from heat. Season with nutmeg, salt, and white pepper. Stir in the ¼ cup grated gruyère (if using). Set aside.

2. Assemble the Sandwiches:

• Preheat your broiler (grill) to high. Lightly toast the bread slices (this prevents sogginess).

• Spread a thin layer of Dijon mustard on two slices of bread.

• Layer each with ham, then a generous handful of grated gruyère.

• Top with the remaining bread slices to form two sandwiches.

3. The Gratinéed Finish (The Key Step):

• Place the sandwiches on a baking sheet. Generously spread the top of each sandwich with béchamel sauce, all the way to the edges.

• Sprinkle the remaining gruyère (and parmesan, if using) over the béchamel.

• Broil for 3-5 minutes, watching closely, until the sauce is bubbly and the cheese is spectacularly spotted with brown.

4. Serve Immediately:

• Serve piping hot, traditionally with cornichons (tiny pickles) and a simple green salad dressed with a sharp vinaigrette to cut through the richness.

The Evolution: Croque Madame

Simply top a fully assembled (but not yet broiled) Croque Monsieur with a fried egg. The runny yolk adds a sublime sauce. Broil as directed.

Pro Tips for Bistro-Quality Results

• Bread is Key: Use a sturdy, good-quality sandwich bread. Slightly stale bread works even better.

• Don’t Skip the Béchamel: It’s what defines the dish, adding moisture and luxurious creaminess.

• Cheese Matters: Gruyère is traditional for its superb melting qualities and nutty flavor. Never use pre-shredded cheese (it contains anti-caking agents that hinder melting).

• The Broiler is Your Friend: For an authentic finish, you must broil/grill. A panini press or skillet will not give you that iconic gratinéed top.

• Make-Ahead: Assemble sandwiches (without béchamel topping) a few hours ahead. Make béchamel, cover surface with plastic wrap, and refrigerate. Bring to room temp, assemble, and broil when ready.

Common Mistakes to Avoid

1. Using the Wrong Heat: Cooking over too high heat will burn the béchamel top before the inside is hot.

2. Skipping the Pre-Toast: This leads to a soggy interior.

3. A Thin Béchamel: The sauce should be thick enough to coat and stay on the sandwich.

4. Overcrowding the Pan: If finishing in a skillet (less traditional), give the sandwiches space to crisp properly.