Recipe

Classic Croque Monsieur

Crispy-edged French ham and cheese with a silky béchamel and a bubbly Gruyère top.

By Matt Campbell

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4.8

A golden brown Croque Monsieur on a white plate with bubbling Gruyere on top, set on a wooden kitchen table with a simple green salad

Croque Monsieur is what happens when a grilled ham and cheese decides to get a little dressed up. You still get the cozy crunch and melty middle, but then you add a quick béchamel and suddenly it is richer, toastier, and honestly kind of unfair to every other sandwich.

This is the version I make when I want something that feels like a cafe lunch but still fits into real life. No fussy ingredients, no culinary school gatekeeping, just a few smart steps that stack up to big payoff. You toast the bread (one side only, so the inside stays soft), build the sandwich, sauce it, then broil it until the top gets bubbly and browned. The whole thing is relaxed, a little chaotic, and absolutely worth licking the spoon.

Ingredients for Croque Monsieur laid out on a kitchen counter, including sliced bread, ham, Gruyere, butter, flour, milk, Dijon mustard, and nutmeg

Why It Works

Crisp edges plus a creamy center: Toasting the bread first keeps it from turning soggy once the béchamel goes on.
Fast béchamel that actually tastes like something: A pinch of nutmeg and a little Dijon bring the classic French flavor without extra work.
Broiler finish for that cafe top: The sauce and cheese bubble and brown in minutes, giving you that signature Croque Monsieur crust.
Flexible and forgiving: Use the ham and cheese you have, just aim for good melt and decent salt.

Pairs Well With

Storage Tips

Best move: Croque Monsieur is peak right after broiling, when the top is crisp and the interior is molten. If you have leftovers, you can still keep them tasty with the right reheat.

Refrigerate: Store cooled leftovers in an airtight container for up to 2 days.
Reheat: Warm on a sheet pan in a 350°F oven for 10 to 15 minutes. Finish with 1 to 2 minutes under the broiler to re-crisp the top. Keep an eye on it.
Microwave: It works in a pinch, but the bread softens. If you microwave, do 30 to 45 seconds, then crisp just the bottom in a hot skillet (do not flip) for 1 to 2 minutes. A lid helps the top warm without turning your stove into a cheese crime scene.
Freezing: Not my favorite with béchamel. The sauce can separate and the bread suffers. If you must, the least-worst approach is to freeze the assembled, toasted sandwiches before adding béchamel and topping cheese. Wrap tightly and freeze up to 1 month. Thaw overnight, then add béchamel and cheese and broil. If you freeze fully finished sandwiches, expect texture changes.

Common Questions

What is a Croque Monsieur?

It is a classic French grilled ham and cheese, usually made with sliced bread, ham, Gruyère (or Emmental), and a béchamel sauce. It is typically finished in the oven or under the broiler so the top gets bubbly and browned.

What is the difference between Croque Monsieur and Croque Madame?

Croque Madame is a Croque Monsieur topped with a fried or poached egg. Same sandwich, just wearing a fancy hat.

Do I have to use Gruyère?

Gruyère is the classic move because it melts beautifully and tastes nutty and savory. Emmental is also traditional. In a pinch, Swiss works. If you want extra punch, mix in a little sharp white cheddar with the Gruyère.

Can I make the béchamel ahead of time?

Yes. Make it up to 2 days ahead and refrigerate. Rewarm gently on the stove with a splash of milk, whisking until smooth.

Why did my béchamel turn lumpy?

Usually the milk went in too fast or the roux was not whisked enough. Fix it by whisking vigorously over low heat for a minute or two. If it is still lumpy, blend it briefly with an immersion blender or strain it.

What bread is best?

Use a sturdy sandwich bread that toasts well: Pullman loaf, sourdough sandwich slices, or good white bread. Super thin soft bread can collapse under the sauce.

My broiler runs wild. Any tips?

Yes. Broilers vary a lot. If yours tends to scorch, use low broil (if you have it) and keep the rack a little farther from the heat. Start checking at 90 seconds. The goal is bubbling and browned, not a new form of charcoal.

A Croque Monsieur on a baking sheet under an oven broiler, with melted cheese and béchamel bubbling and browning on top

Matt Campbell

I have always had a huge passion for the culinary arts, people, working as a team, and so on. I wanted to pursue my love for cooking initially at Virginia Commonwealth University with a culinary arts degree; however, I instead decided to apply myself and acquire more practical skills. My end goal is to eventually open my own restaurant or similar establishment.

Kitchen Essentials

Medium saucepan (for béchamel)
Whisk
Measuring cups and spoons
Skillet or griddle (for toasting bread)
Sheet pan
Wire rack (optional, helps airflow)
Oven broiler
Microplane or grater (for cheese)

When I was first trying to level up my home cooking, Croque Monsieur was one of those dishes that made me feel like I had a secret French cafe tucked inside my apartment kitchen. It is still just a sandwich, which is comforting. But it also asks you to whisk a quick béchamel and pay attention for a few minutes, which feels like cooking with intention instead of autopilot. Also, I love any recipe where the instruction “broil until bubbly” is the grand finale. It is dramatic, it is delicious, and it makes an average weekday feel a little more like a plan.