Mom's Best Recipes
Recipe

Croque Monsieur

A French-style ham and cheese sandwich often finished with mustard béchamel and Gruyère, baked until crisp, creamy, and deeply comforting.

Author By Matt Campbell
4.8
A plated croque monsieur with bubbling Gruyère on top, creamy béchamel peeking at the edges, and a small side salad on a neutral stoneware plate
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If a grilled cheese grew up, bought a nice coat, and started hanging out in French bistros, it would basically be this. Croque Monsieur is my cozy, slightly chaotic answer to “What should we do with this ham and this loaf of bread?” It is crisp on the outside, creamy in the middle, and unapologetically sauced.

The move that makes this more than a standard ham and cheese is a quick mustard béchamel . It takes about 6 minutes, tastes like you tried really hard, and makes the whole sandwich feel like comfort food with posture.

Ingredients for croque monsieur on a light kitchen counter including sliced bread, ham, Gruyère, butter, flour, milk, Dijon mustard, and a small dish of nutmeg

Why It Works

  • Crisp edges, gooey center: Pan-toast plus a quick bake gives you crunch without drying the sandwich out.
  • Fast flavor boost: Dijon in the béchamel turns a simple sauce into something you will want to eat with a spoon.
  • Accessible ingredients: Sandwich bread, deli ham, milk, butter, flour, and a good melting cheese.
  • Flexible method: Make it as a skillet-to-oven sandwich or bake a tray for a crowd.

Pairs Well With

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Storage Tips

Fridge: Wrap leftovers tightly (foil works great) and refrigerate up to 3 days.

Reheat (best): Warm in a 350°F oven for 10 to 15 minutes until hot, then uncover for 2 to 3 minutes to re-crisp the top.

Reheat (quick): Air fry at 350°F for 5 to 7 minutes. Keep an eye on it because cheese goes from bubbly to burnt fast.

Freezing: You can freeze fully cooked croques, but expect the sauce to loosen a bit when thawed. For best results, freeze assembled but unbaked sandwiches (without the top béchamel). Wrap well, freeze up to 1 month, then thaw overnight. Add béchamel and cheese on top right before baking.

Common Questions

What is Croque Monsieur?

It is a classic French bistro sandwich: ham and cheese on bread, toasted, then often baked or broiled. Many versions are finished with béchamel and more cheese until bubbly. If you have seen it on a menu, this is that vibe.

Is this a classic version?

Pretty close. A traditional croque monsieur is ham, cheese, and a hot finish (usually baked or broiled), and it is often topped with béchamel. This version leans into the sauce and mustard on purpose, using a simple home-kitchen method so you get crisp bread without overcomplicating your evening.

What bread works best?

Thick-cut white sandwich bread, brioche, or Pullman style bread are my favorites. Sourdough also works, but it can get very crunchy, so watch bake time.

What cheese should I use?

Gruyère is the classic. Swiss is a great budget-friendly stand-in. If you want extra stretch, you can do half Gruyère and half mozzarella, but that is a non-classic move (a delicious one).

Can I make it ahead?

Yes. Make the béchamel up to 3 days ahead and refrigerate. It will thicken as it chills, so rewarm it gently and whisk in a splash of milk until it is smooth and spoonable again. Assemble sandwiches right before baking so the bread stays crisp.

How do I keep it from getting soggy?

Two things: toast the bread first and keep the béchamel thick enough to cling. If your sauce is runny, simmer it 1 to 2 minutes longer.

What is a Croque Madame?

The fun variation: top the finished croque with a fried egg . Same sandwich, plus a sunny little hat.

Thick béchamel sauce being whisked in a small stainless saucepan on a stovetop in a bright home kitchen

I did not go the culinary degree route in the end, but I have always chased that “restaurant comfort” feeling at home. This sandwich is one of my favorite examples. It is humble on paper, then you add béchamel and suddenly it is wearing a tiny beret and demanding a side salad. I make it when I want something cozy but still a little sharp and salty, and when I want dinner to feel like a win without turning my kitchen into a full production.