Classic Croque Monsieur: The Quintessential French Ham and Cheese Sandwich

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  1. In a medium saucepan, melt the butter over medium heat.

  2. Whisk in the flour, cooking for 1–2 minutes to form a roux (it should smell slightly nutty but not browned).

  3. Slowly pour in the warm milk, whisking constantly until the mixture thickens into a smooth sauce.

  4. Add Dijon mustard, nutmeg, salt, and pepper. Stir until fully incorporated.

  5. Remove from heat and let it cool slightly—it should be thick but spreadable.

🥄 Tip: If your sauce is too thick, whisk in a splash more milk. If too thin, cook for a few more minutes.

Step 2: Assemble the Sandwiches

  1. Preheat your oven to 425°F (220°C). Line a baking tray with parchment paper.

  2. Lightly butter one side of each slice of bread. Place 4 slices butter-side down.

  3. Spread a thin layer of béchamel sauce over each slice.

  4. Add one or two slices of ham, then sprinkle with a little Gruyère cheese.

  5. Top with the remaining bread slices, butter-side up.

  6. Spread another thin layer of béchamel on top of each sandwich.

  7. Sprinkle generously with the rest of the Gruyère cheese.

Step 3: Bake to Golden Perfection

  1. Place the sandwiches on the prepared baking tray.

  2. Bake for 12–15 minutes, or until the  cheese is bubbling and golden brown.

  3. For an extra crisp finish, place under the broiler for 1–2 minutes (watch closely!).

Step 4: Serve and Enjoy

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