Croque-Monsieur Sandwich Recipe

If you have a craving for something irresistibly decadent yet comforting, the Croque-Monsieur Sandwich is your perfect match. This classic French ham and cheese delight is an absolute showstopper, boasting layers of toasted bread, creamy béchamel sauce, and melted Gruyère cheese that come together to create a satisfyingly rich and flavorful bite. Whether you’re whipping it up for a lazy weekend brunch or impressing guests at a casual gathering, the Croque-Monsieur Sandwich is a guaranteed crowd-pleaser that feels like a warm hug on a plate.

Ingredients You’ll Need

Ingredients You’ll Need

This recipe brings together simple, everyday ingredients that each play a crucial role in building the sandwich’s signature taste and texture. From the buttery bread that crisps to golden perfection to the nutty Gruyère cheeses that melt into gooey goodness, every component counts.

• Unsalted Butter (3 1/2 tablespoons, reserve 1/2 tbsp for bread): Essential for a silky béchamel and perfectly buttered toast.
• All-purpose Flour (1 1/2-2 tbsp, or 1/4 tbsp Guar gum): Thickens the béchamel sauce to creamy perfection.
• Whole Milk (2-2 1/2 cups): Creates the rich base for the béchamel sauce.
• Gruyère Cheese (3 oz grated and 8-10 oz shredded): Adds nutty, melty goodness that’s crucial for authenticity; Swiss cheese can be a substitute.
• Ground Black Pepper (1 teaspoon): Brings subtle heat and balances the flavors.
• Kosher Salt (1 teaspoon): Enhances every flavor in the sandwich.
• Fresh Thyme (1 sprig, stems removed): Infuses the béchamel with a delicate herbal aroma.
• Melted Unsalted Butter (1/2 tablespoon reserved from béchamel sauce): Used to butter the bread for toasting.
• Sandwich Bread (8 slices, rustic or brioche preferred): Provides a sturdy and flavorful base for the sandwich.
• Premium Ham (8 slices, Hillshire Farm® recommended): Classic savory meat that complements the cheese and sauce beautifully.
• Chopped Fresh Chives or Green Onions (2 teaspoons): Adds a fresh, bright finish.

How to Make Croque-Monsieur Sandwich

Step 1: Make the Béchamel Sauce

Start by melting butter in a small saucepan over low heat, then whisk in all-purpose flour all at once to form a smooth roux. Cook this mixture for about 2 minutes without letting it brown, which develops a subtle nutty base for your sauce. Gradually add warm milk while whisking continuously to prevent lumps. Let the mixture simmer gently, stirring often until it thickens into a luscious béchamel. Once thickened, season with salt, pepper, and stir in grated Gruyère cheese and Swiss cheese, ensuring the sauce is smooth, creamy, and flavorful.

Step 2: Prepare the Bread

While the sauce is resting, preheat your oven to 375 degrees Fahrenheit, setting the rack toward the bottom third to get the perfect toast. Lay out the slices of sandwich bread on a baking sheet, brush each slice lightly with reserved melted butter, and toast them just until golden and crisp. This step locks in a crunchy texture that contrasts beautifully with the creamy fillings.

Step 3: Assemble the Croque-Monsieur Sandwich

Now comes the fun part—building your sandwich. Spread about one tablespoon of béchamel sauce evenly over the toasted halves, then layer generous slices of ham and a hearty handful of shredded Gruyère cheese atop. Cover with the remaining toasted bread slices, and spread another tablespoon of béchamel sauce on the top. Finally, be generous with a topping of shredded Gruyère cheese to get that adorable, bubbly crust when broiled.

Step 4: Broil to Perfection

Turn your oven’s broiler to high and slide the baking sheet with sandwiches under the heat. Keep a close eye on them as the béchamel and cheese top will start bubbling and turn nicely golden within about 2 minutes. This step is where magic happens—the cheese crisps just right, melding all the flavors into one harmonious bite.

Step 5: Slice and Serve

Once broiled, remove the sandwiches from the oven and let them sit for a minute to settle. Slice each Croque-Monsieur Sandwich in half diagonally—it’s the classic way to serve and makes the layers of ham, béchamel, and melting cheese all visible and inviting. Now, get ready to dig in!

How to Serve Croque-Monsieur Sandwich

Garnishes

Add a sprinkle of freshly chopped chives or green onions on top for a lovely pop of color and a subtle oniony brightness that cuts through the richness. This simple garnish makes the Croque-Monsieur Sandwich look as impressive as it tastes.

Side Dishes

This sandwich pairs beautifully with light, fresh sides like a crisp green salad with vinaigrette or a tangy tomato salad. Some caramelized onions or a handful of cornichons offer a perfect contrast to the creamy, cheesy sandwich. For a heartier option, crispy fries or roasted vegetables work wonderfully.

Creative Ways to Present

Feeling fancy? Cut your Croque-Monsieur Sandwich into bite-sized squares and serve as fun finger food for a party. Alternatively, try layering different flavored mustards between the ham and cheese for a zesty twist. You can even experiment with swapping ham for smoked turkey or adding sautéed mushrooms to give the classic French favorite your own personal spin.

Make Ahead and Storage

Storing Leftovers

Leftover Croque-Monsieur Sandwiches can be stored in an airtight container in the refrigerator for up to two days. Keep in mind that the béchamel might thicken as it cools, so it’s best to reheat carefully to maintain that luxurious creaminess.

Freezing

If you want to freeze portions, wrap each sandwich tightly in plastic wrap and then aluminum foil to prevent freezer burn. They’ll keep well frozen for up to one month, ready to be warmed up whenever you need a quick gourmet treat.

Reheating

The best way to reheat is in the oven at 350 degrees Fahrenheit for about 10-15 minutes. This method ensures the bread stays crisp and the cheese melts back to ooey-gooey perfection. Avoid the microwave if you want to preserve texture and flavor.

FAQs

Can I use a different cheese instead of Gruyère?

Absolutely! Swiss cheese is a great substitute because it melts well and has a similarly mild, nutty flavor. You could even use Emmental or Jarlsberg if that’s what you have on hand, though the authentic Croque-Monsieur Sandwich shines brightest with Gruyère.

Is there a vegetarian version of Croque-Monsieur?

Yes! Simply skip the ham and add sautéed mushrooms, spinach, or grilled vegetables for an equally delicious vegetarian twist. The béchamel and cheese combo will still give you that rich, satisfying experience.

Can I make this sandwich gluten-free?

To make it gluten-free, swap out the sandwich bread for a gluten-free variety and use a thickening agent like guar gum instead of regular flour for the béchamel. It still turns out wonderfully indulgent and perfect for those with gluten sensitivities.

What drink pairs well with a Croque-Monsieur Sandwich?

A crisp white wine like a Sauvignon Blanc or a light beer pairs wonderfully, cutting through the richness of the béchamel and cheese. For a non-alcoholic option, a sparkling water with a splash of lemon works beautifully to refresh the palate.

How can I make the béchamel sauce extra smooth?

The key is to whisk constantly while adding warm milk slowly to the butter-flour roux, then cooking it gently without rushing. Removing the thyme sprig before adding the cheese helps keep the sauce perfectly silky and free of bits.

Final Thoughts

Whipping up the Croque-Monsieur Sandwich is a joyful experience that yields an irresistible, indulgent meal every single time. Whether you’re new to French classics or simply craving a sandwich upgrade, this recipe lets you enjoy timeless flavors with approachable techniques. Go on, make one today and savor every melty, crispy bite!

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