The Croque Monsieur is a quintessential French café sandwich combining ham, cheese, and béchamel sauce, baked to golden perfection. This oven-baked version is simple, less messy than pan-frying, and yields a wonderfully crispy crust with a creamy, cheesy interior. It’s the perfect indulgent lunch or light dinner that impresses with minimal effort.
Ingredients
- 8 slices white sandwich bread (preferably slightly stale)
- 4 slices cooked ham (about 100g / 3.5 oz)
- 2 cups (200g) grated Gruyère cheese, divided
- 2 tablespoons unsalted butter
- 2 tablespoons all-purpose flour
- 1 ½ cups (360ml) whole milk, warmed
- 1 teaspoon Dijon mustard
- Salt and freshly ground black pepper, to taste
- Pinch of freshly grated nutmeg (optional)
- Butter or non-stick spray, for greasing
Instructions
- Prepare the béchamel sauce: In a medium saucepan, melt the butter over medium heat. Once melted and bubbling, whisk in the flour and cook for 1-2 minutes, whisking constantly, to form a smooth roux. It should be pale and not browned.
- Slowly add the warmed milk in small increments, whisking continuously to prevent lumps. Continue cooking and whisking until the sauce thickens and coats the back of a spoon, about 5-7 minutes.
- Remove from heat and stir in Dijon mustard, half (1 cup) of the grated Gruyère cheese, salt, pepper, and nutmeg if using. Mix until cheese melts and sauce is smooth. Set aside.
- Preheat the oven: Set your oven to 400°F (200°C). Grease a baking sheet or line it with parchment paper.
- Assemble the sandwiches: Lay 4 slices of bread on the baking sheet. Spread a generous layer of béchamel sauce on each slice, then top with a slice of ham. Sprinkle a little cheese over the ham, then cover with the remaining 4 slices of bread.
- Spread the remaining béchamel sauce over the top of each sandwich, then sprinkle the remaining Gruyère cheese evenly on top.
- Bake: Place the baking sheet in the preheated oven and bake for 10-15 minutes, or until the cheese topping is golden and bubbling and the bread edges are crisp.
- Broil for extra color (optional): For a deeper golden crust, switch the oven to broil and broil the sandwiches for 1-3 minutes, watching carefully to avoid burning.
- Remove from oven, let cool for a couple of minutes, then serve immediately.
Tips
- Cheese substitutions: Gruyère is traditional, but you can use Emmental, Comté, or a sharp Swiss cheese for similar melt and flavor.
- Bread choice: Slightly stale or day-old bread works best as it holds up to the sauce without becoming soggy. Avoid overly soft sandwich bread.
- Make ahead: You can assemble the sandwiches a few hours in advance, cover tightly with plastic wrap, and refrigerate. Bring to room temperature before baking.
- Common mistake: Don’t skip warming the milk before adding it to the roux; cold milk can cause lumps in your béchamel sauce.
Serving Suggestions
Serve your Croque Monsieur with a light green salad dressed with a simple vinaigrette to cut through the richness. A crisp pickle or cornichon on the side adds a traditional French touch. For drinks, a dry white wine like a Sauvignon Blanc or a light beer pairs well with the creamy, cheesy flavors. You can also enjoy it with a bowl of tomato soup for a comforting meal.
Variations
Croque Madame: Add a fried or poached egg on top of the finished Croque Monsieur for a Croque Madame. The runny yolk adds extra richness and makes it perfect for brunch.
Vegetarian version: Replace ham with sautéed mushrooms, roasted vegetables, or spinach for a meatless option. You can also add caramelized onions for sweetness.
Different sauces: While béchamel is classic, you can experiment with adding a touch of mustard or even a light cheese sauce made with crème fraîche for a tangier bite.
Gluten-free option: Use gluten-free bread and substitute the all-purpose flour in the béchamel with a gluten-free flour blend or cornstarch to keep it smooth.
Storage and Reheating
Leftover Croque Monsieur sandwiches can be stored in an airtight container in the refrigerator for up to 2 days. To reheat, place them on a baking sheet and warm in a preheated oven at 350°F (175°C) for 10-12 minutes until heated through and the cheese topping is bubbly again. Avoid microwaving if possible, as it can make the bread soggy. For longer storage, you can freeze assembled but unbaked sandwiches wrapped tightly in plastic wrap and foil for up to 1 month. Bake from frozen, adding a few extra minutes to the baking time.
Frequently Asked Questions
Can I use a different type of ham?
Yes, you can use any cooked ham you prefer, such as Black Forest ham, honey ham, or even prosciutto. Just ensure it is thinly sliced and cooked, as the sandwich will not be cooked long enough to cook raw ham.
What if I don’t have Gruyère cheese?
Gruyère is favored for its meltability and nutty flavor, but Emmental, Comté, or even a sharp Swiss cheese can be used. Avoid very mild cheeses like mozzarella which melt well but lack the classic flavor.
Is béchamel sauce hard to make?
Not at all. Béchamel is a simple white sauce made by cooking butter and flour together to form a roux, then gradually whisking in warm milk until thickened. The key is continuous whisking to avoid lumps. It can be made in under 10 minutes.
Can I make Croque Monsieur ahead of time?
Yes, you can assemble the sandwiches a few hours ahead and refrigerate them tightly covered. Bake just before serving for best texture. Fully baked sandwiches don’t reheat as crisply but still taste great.
Why bake instead of pan-fry?
Baking is less messy, requires less attention, and yields an evenly browned sandwich with a crisp crust and perfectly melted cheese. It’s easier to prepare multiple sandwiches at once and keeps your stovetop clean.
What should I do if my béchamel sauce is lumpy?
If lumps form, you can strain the sauce through a fine mesh sieve or use an immersion blender to smooth it out. To prevent lumps, add warm milk slowly while whisking vigorously and keep the heat moderate.
Is it safe to use day-old bread?
Yes, slightly stale bread is ideal because it absorbs the béchamel sauce without becoming soggy or falling apart. Fresh bread tends to be too soft and results in a mushy sandwich.
How do I know when the Croque Monsieur is done?
Look for a golden-brown, bubbly cheese topping and crisp edges on the bread. The béchamel sauce inside should be creamy and hot. Usually, 10-15 minutes at 400°F is sufficient.
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