Vegetarian Grilled Zucchini Croque Mademoiselle Recipe

Photograph: Kerry Saretsky

This vegetarian version of Croque Monsieur starts with thick, crusty slices of white sandwich bread. I stuff the inside with chargrilled slices of zucchini made earthy with herbes de Provence and tons of Emmenthaler, which gives a more delicate flavor than traditional Gruyère. Over the top goes a béchamel flavored with piquant Dijon mustard and a scrape of nutmeg. Then, more cheese, set under the broiler to bubble and blister. It's everything you want in a Croque Monsieur, made just slightly more delicate—hence, Croque Mademoiselle.

Recipe Facts

Active: 20 mins
Total: 20 mins
Serves: 1 giant sandwich

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  • 1 medium zucchini, cut into 4 long planks

  • 2 teaspoons olive oil

  • Kosher salt and freshly ground black pepper

  • Pinch herbes de Provence

  • 1/2 tablespoon unsalted butter, room temperature, plus more for spreading on the bread

  • 1/2 tablespoon all-purpose flour

  • 1/2 cup milk

  • 1/2 tablespoon Dijon mustard

  • Pinch freshly grated nutmeg

  • 2 (2/3-inch) slices fresh white sandwich bread

  • 1 1/4 cups grated Emmenthaler cheese


  1. Preheat a grill or grill pan to high heat. Toss the zucchini lightly with olive oil, salt, pepper, and herbes de Provence. Grill until charred and cooked through, about 4 minutes per side. Set aside.

  2. In a small saucepan, melt the butter. Whisk in the flour and cook over low heat for 1 minute. Whisk in the milk, and continue whisking until the mixture has thickened enough to thickly coat a spoon. Set aside.

  3. Preheat broiler to high. Spread one side of each slice of bread with butter. Place 6 tablespoons grated cheese on un-buttered side of one slice of bread. Top with the zucchini, then top with 6 more tablespoons cheese. Close sandwich, buttered side out. Toast the sandwich in a nonstick skillet over medium heat until golden brown on both sides, about 3 minutes per side.

  4. Place the sandwich on a foil-lined rimmed baking sheet. Spread the top with the white sauce, then top with remaining 1/2 cup cheese. Broil until the cheese is toasted. Serve immediately.

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Nutrition Facts (per serving)
1425 Calories
89g Fat
76g Carbs
81g Protein
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Nutrition Facts
Servings: 1
Amount per serving
Calories 1425
% Daily Value*
Total Fat 89g 114%
Saturated Fat 50g 252%
Cholesterol 249mg 83%
Sodium 993mg 43%
Total Carbohydrate 76g 28%
Dietary Fiber 5g 18%
Total Sugars 18g
Protein 81g
Vitamin C 26mg 131%
Calcium 2254mg 173%
Iron 5mg 29%
Potassium 1029mg 22%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)