Croque Monsieur
Golden, crispy toasted bread hugging layers of savory ham and nutty Gruyère cheese, all blanketed in a velvety béchamel sauce. This French bistro classic bakes to bubbly perfection and delivers a deeply satisfying crunch with every bite.
For 4 servings
- prep
Preheat the oven and gather ingredients.
Preheat the oven to 425°F (220°C). Shred the Gruyère, slice the ham if needed, and measure out all remaining ingredients.
TIPShred your own cheese from a block — pre-shredded cheese contains anti-caking agents that prevent smooth melting. - saute · ~8 min
Make the béchamel sauce.
1.Melt 2 tablespoons of butter in a small saucepan over medium heat.2.Whisk in the flour and cook, stirring constantly, for 1 minute until bubbly and pale golden (do not let it brown).3.Slowly pour in the warm milk while whisking vigorously to avoid lumps.4.Bring to a gentle simmer and cook, whisking often, until the sauce thickens enough to coat the back of a spoon (3–4 minutes).5.Remove from heat and stir in half of the shredded Gruyère, the salt, pepper, and nutmeg. Whisk until smooth.TIPWarm the milk before adding — cold milk takes longer to thicken and is more prone to clumping. - prep
Assemble the sandwiches.
1.Lay out 4 slices of bread on a clean work surface.2.Spread ½ teaspoon of Dijon mustard on each slice.3.Layer each with 2 slices of ham, then a small handful of the remaining shredded Gruyère.4.Top with the remaining 4 slices of bread to create 4 sandwiches.TIPPress down gently on each sandwich so the filling makes good contact with the bread. - fry · ~6 min
Toast the sandwiches on the stovetop.
1.Melt the remaining 1 tablespoon of butter in a large skillet over medium heat.2.Place the sandwiches in the skillet and cook until the bottoms are golden brown and crisp, about 2–3 minutes.3.Flip carefully and toast the other side until golden, another 2–3 minutes.TIPUse a spatula and a gentle hand — the sandwiches are still cold inside and can slide apart. - assemble
Top with béchamel and finish in the oven.
1.Transfer the toasted sandwiches to a baking sheet lined with parchment paper.2.Divide the béchamel sauce evenly over the top of each sandwich, spreading it all the way to the edges.3.Sprinkle any remaining Gruyère on top of the sauce.TIPSpreading the sauce to the edges prevents the uncovered bread from burning under the broiler. - bake · ~10 min
Bake until bubbly and golden.
Place the baking sheet on the middle rack and bake for 6–8 minutes. Switch the oven to broil for the final 1–2 minutes, watching closely, until the cheese is bubbly and beautifully browned in spots.
TIPDon't walk away during broiling — the cheese can go from perfectly golden to burnt in under 30 seconds. - serve · ~2 min
Rest briefly and serve hot.
Let the sandwiches rest on the baking sheet for 2 minutes before serving. Serve whole or sliced in half with a small green salad alongside.
What to keep in mind.
6 tips from the recipe — small details that make a real difference to the final dish.
- 1Shred Gruyère from a block for smooth, creamy melting without clumping.
- 2Warm the milk before adding to the béchamel to prevent lumping and speed thickening.
- 3Use a firm, thick-sliced white bread so the sandwich holds up to the sauce and baking.
- 4Spread béchamel all the way to the bread edges to prevent burning under the broiler.
- 5Watch the broiler closely — cheese can go from golden to burnt in 30 seconds.
- 6Let the finished sandwich rest 2 minutes before cutting to keep the layers intact.
Adapt it for your goals.
Croque Madame
Top each finished Croque Monsieur with a fried or poached egg. The runny yolk adds richness and turns the sandwich into a hearty brunch dish.
Low CarbLow-Carb
Swap the bread for two large, well-drained slices of roasted eggplant or zucchini, and use almond flour in the béchamel for a keto-friendly version.
VeggieVeggie
Replace ham with sautéed mushrooms and spinach, or roasted sliced portobello. The earthy flavors complement the Gruyère and nutmeg beautifully.
Add Chicken & PestoAdd Chicken & Pesto
Substitute ham with shredded rotisserie chicken and a thin spread of basil pesto under the béchamel for a fusion twist.
Why this is on our healthy list.
Protein-Packed
Ham and Gruyère cheese provide high-quality animal protein, supporting muscle repair and satiety.
Calcium from Gruyère
Gruyère cheese is a good source of calcium, important for strong bones and teeth.
Whole Milk Nutrients
The whole milk in the béchamel contributes calcium, vitamin D, and vitamin B12.
Frequently asked questions
It's best to shred your own. Pre-shredded cheese contains anti-caking agents like potato starch that prevent smooth, creamy melting, leading to a grainy sauce.
