At a glance
You're building a sophisticated French sandwich by layering toasted bread with creamy béchamel sauce, ham, and cheese, then baking it until golden—the trickiest part is making a silky béchamel without lumps. A runny fried egg goes on top just before serving, bringing everything together beautifully. The whole thing comes together in about 30 minutes, making it perfect for a fancy breakfast or impressive lunch.
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Toast the bread and grate the cheese
Preheat the oven to 180°C. Arrange the slices of toasting bread on a baking tray lined with parchment paper and toast on both sides until golden. Meanwhile, grate the Gruyère.
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Start the béchamel
Melt the butter in a saucepan over low heat. Add the plain flour and whisk continuously until you get a pale roux with no raw flour taste (about 2–3 minutes).
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Make the creamy béchamel sauce
Whisking constantly, gradually pour in the cold milk to avoid lumps. Cook over low heat, stirring, until the sauce thickens into a smooth, creamy consistency (about 5–7 minutes).
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