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Cordon-Bleu de Courgette Gratiné

Cordon-Bleu de Courgette Gratiné is a golden, melty zucchini bake with smoky ham, creamy cheese, and a crisp breadcrumb crust. A comforting French-inspired dinner with irresistible gratinée charm.

Min-Jae Park - Head Chef
By Min-Jae Park
3.9 (321 reviews)
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Delicious Cordon-Bleu de Courgette Gratiné - homemade French comfort food recipe
Cordon-Bleu de Courgette Gratiné - Ready to enjoy

Cordon-Bleu de Courgette Gratiné is a French-inspired zucchini bake that turns humble summer squash into a luxurious, bubbling dinner. You should make this Cordon-Bleu de Courgette Gratiné because it delivers the comfort of a classic cordon bleu with a lighter, garden-fresh soul. The first time I pulled this from the oven, the aroma of toasted breadcrumbs, melted cheese, and savory ham filled the kitchen like a promise. Each slice is tender at the center, crisp on top, and deeply satisfying in that unmistakable gratin way.

Why I Love This Recipe

What I love most about this dish is how it borrows the spirit of cordon bleu—layered richness, careful assembly, and that glorious contrast of textures—then reimagines it through the lens of French home cooking. Zucchini, or courgette, is treated with respect here: sliced thin, tucked around the filling, and baked until it softens into silky layers without losing its shape. That technique reminds me of the kind of practical elegance you find in provincial kitchens, where nothing is wasted and everything is coaxed into something beautiful. The browned crust, the creamy interior, the salty ham—it all tastes like a dish made by someone who understands both restraint and indulgence. As a chef, I find that balance irresistible.

Step-by-step preparation of Cordon-Bleu de Courgette Gratiné showing ingredients and initial cooking steps
Preparing the ingredients
Close-up of Cordon-Bleu de Courgette Gratiné showing texture, layers, and glossy finish
Close-up of the recipe

What You Need From Your Kitchen

Mandoline slicer

Helps create evenly thin courgette slices so the layers cook at the same rate and stay neatly structured

Rimmed baking dish

Holds the assembled gratin securely and gives the cheese and breadcrumbs room to brown beautifully

Box grater

Ideal for fresh cheese that melts smoothly and creates a more luxurious, cohesive filling

Broiler-safe oven

Essential for achieving that final gratinée crust—deeply golden, crisp, and lightly blistered

Perfect Pairings

Crisp green salad with Dijon vinaigrette

Its sharp acidity cuts through the creamy cheese and salty ham, refreshing each bite

Chilled Sauvignon Blanc

The bright citrus and herbal notes echo the zucchini while lifting the richness of the gratin

Crusty baguette

Perfect for catching the melted cheese and savory juices left on the plate

Roasted cherry tomatoes

Their sweetness and gentle acidity add color and a juicy counterpoint to the baked layers

Light supper on a summer evening

This dish feels special without being heavy, making it ideal for relaxed dinners with friends

Perfectly cooked Cordon-Bleu de Courgette Gratiné served and ready to eat - final result
The perfect finished result

Pro Tips

  • Slice the courgettes lengthwise into even planks, about 1/4 inch thick. Uniform thickness matters here: it ensures the zucchini softens at the same rate and creates those elegant, layered slices.
  • Use a well-reduced béchamel or creamy sauce, not a loose one. A thicker sauce clings to the zucchini and ham, giving the gratin its luxurious, spoon-coating texture instead of leaking into the dish.
  • Toast the breadcrumbs lightly with a little butter before topping. That extra step builds a deeper nutty aroma and helps the crust turn evenly golden before the cheese underneath overbrowns.
  • Let the baked gratin rest 8-10 minutes before serving. This pause allows the molten cheese to settle, so each portion cuts cleanly and the layers stay distinct rather than collapsing on the plate.

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Cordon-Bleu de Courgette Gratiné

Cordon-Bleu de Courgette Gratiné layers tender zucchini with savory ham and luscious cheese, then finishes under high heat for a deeply bronzed crust. The result is silky, crisp, and beautifully balanced—light enough for weeknights, yet elegant enough to serve with pride.

Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Category: Dinners
Servings: 4 yields
Difficulty: Medium
Cuisine: French

Ingredients

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  • 4 medium zucchini, trimmed and sliced lengthwise into 1/4-inch planks
  • 8 thin slices cooked ham
  • 8 slices Gruyère cheese, about 6 ounces total
  • 1 cup grated Emmental cheese
  • 1 cup panko breadcrumbs
  • 3 tablespoons unsalted butter, melted
  • 2 tablespoons extra-virgin olive oil
  • 1 clove garlic, finely grated
  • 1 teaspoon fine sea salt
  • 1/2 teaspoon freshly ground black pepper
  • 1/2 teaspoon dried thyme
  • 2 tablespoons chopped flat-leaf parsley

Instructions

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  1. 1
    Prepare the zucchini
    Preheat the oven to 400°F and line a baking sheet with parchment. Brush the zucchini planks lightly with olive oil, season with salt and pepper, then roast 8 minutes to drive off excess moisture so the final gratin stays structured, not watery.
  2. 2
    Build the cordon bleu layers
    Lay out the warm zucchini planks in pairs, slightly overlapping like a neat lattice. Top each with a slice of ham and a slice of Gruyère, then sandwich with another zucchini plank. Press gently so the filling adheres without squeezing out the cheese.
  3. 3
    Arrange for baking
    Transfer the assembled parcels to a lightly oiled baking dish, seam side down. Tuck them close together so they support one another during baking. A snug fit helps the cheese melt evenly and encourages those appealing browned edges around the pan.
  4. 4
    Mix the gratin topping
    Combine panko, melted butter, Emmental, garlic, thyme, and parsley in a bowl. Season lightly with pepper. The mixture should feel sandy and moist, not greasy; this balance is what gives the crust its delicate crunch and golden, bakery-style finish.
  5. 5
    Top and bake
    Spoon the breadcrumb mixture evenly over the zucchini parcels, covering the surface from edge to edge. Bake for 18 to 22 minutes, until the cheese is bubbling and the top is deeply golden. If needed, finish under the broiler for 1 to 2 minutes.
  6. 6
    Rest before serving
    Let the gratin stand for 5 minutes after baking. This brief rest allows the molten cheese to settle, making cleaner portions and preserving the layered structure. The aroma should be nutty, savory, and faintly sweet from the roasted zucchini.
  7. 7
    Plate and finish
    Use a wide spatula to lift each portion carefully onto warm plates. Garnish with a little extra parsley if desired. Serve immediately while the crust is crisp, the ham is fragrant, and the cheese stretches in luscious, satisfying ribbons.

Nutrition Facts (Per Serving)

Calories 412
Total Fat 25.6g
Carbohydrates 18.4g
Protein 28.7g

Chef's Notes

  • For make-ahead prep, assemble the Cordon-Bleu de Courgette Gratiné up to the breadcrumb topping, then refrigerate uncovered for 6-8 hours so the zucchini stays structured and the crust still browns beautifully.
  • If your zucchini are especially watery, salt the slices and rest them 15 minutes before layering. Pat them dry well; this keeps the gratin from turning soupy and preserves that tender-yet-firm bite.
  • Leftovers store best in a shallow airtight container once fully cooled. The breadcrumb top softens overnight, but a quick reheat in a hot oven restores the golden, savory crunch.
  • You can swap the ham for smoked turkey or thinly sliced chicken breast, but keep the filling modest. This dish relies on clean layers, not excess stuffing, to slice neatly and hold its shape.
  • For freezing, wrap individual portions tightly after baking and cooling. Freeze for up to 2 months, then reheat from thawed in the oven so the cheese melts evenly without drying the zucchini.

Frequently Asked Questions

Yes, you can assemble Cordon-Bleu de Courgette Gratiné ahead of time. Build the layers, add the sauce and cheese, then hold the breadcrumb topping until just before baking if possible. Refrigerate up to 24 hours. Bake straight from the fridge, adding a few extra minutes so the center heats through and the top turns deeply golden.

Store leftover Cordon-Bleu de Courgette Gratiné in an airtight container in the refrigerator once it has cooled completely. It keeps well for 3 to 4 days. Reheat in the oven at moderate heat so the zucchini warms evenly and the cheese becomes creamy again. The microwave works, but the topping will soften more.

Yes, you can freeze Cordon-Bleu de Courgette Gratiné, though the zucchini will be a little softer after thawing. For best results, freeze baked portions tightly wrapped and cooled. Thaw overnight in the refrigerator, then reheat in the oven until hot and the top regains some crispness. Individual portions freeze better than a whole dish.

Cordon-Bleu de Courgette Gratiné pairs beautifully with a crisp green salad, lemony vinaigrette, or a simple tomato salad to cut through the richness. It also works with roasted potatoes, rice, or crusty bread if you want a heartier meal. Keep sides fresh and bright so the creamy, savory layers remain the star.

Yes, eggplant can replace zucchini in Cordon-Bleu de Courgette Gratiné, but it needs a little more care. Slice it evenly, salt it well, and pre-cook or roast it slightly so it becomes tender. Eggplant brings a richer, silkier texture and a deeper flavor, while zucchini stays lighter and more delicate.

To prevent a watery Cordon-Bleu de Courgette Gratiné, salt the zucchini slices first, let them sit, then blot them dry thoroughly. Use a thick sauce and avoid overloading the layers with filling. Baking in a hot oven also helps evaporate excess moisture and gives the top a better gratiné finish.