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Croque Monsieur with Mornay Sauce

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Rating: 5   Reviews: 1 See Reviews
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Active Time:  30 Minutes
Total Time:  50 Minutes
  4 sandwiches
A traditional French croque monsieur sandwich is usually dipped into eggs then grilled on a sandwich-grilling iron. At my restaurant, Campanile, we serve this traditional French sandwich on bread from our bakery, La Brea Bakery, and with the added decadence of a creamy cheese sauce. - Nancy Silverton
For the Mornay Sauce:
2 tablespoons butter
1/4 cup finely chopped onion
Pinch of kosher salt
1 bay leaf
2 tablespoons all-purpose flour
2 cups whole milk
1/2 cup finely grated gruyere cheese
1/4 cup finely grated Parmigiano-Reggiano
1 large egg yolk
For the Sandwiches:
6 tablespoons unsalted butter
8 slices fresh country-style white bread
1 pound gruyere cheese, sliced 1/16 inch thick (about 24 slices)
12 ounces thinly sliced ham (about 16 slices)
Croque Monsieur with Mornay Sauce Recipe at
Melt butter in heavy medium saucepan over medium heat. Add onion and pinch of salt. Saute until onion is tender and translucent, about 5 minutes. Add flour and stir 3 minutes (do not brown). Gradually whisk in milk. Add bay leaf. Simmer until sauce thickens, stirring occasionally, about 5 minutes. Season with salt and pepper. Cool to lukewarm, about 30 minutes. Gradually add cheese and stir until completely melted. Remove Mornay sauce from heat. Lightly beat egg yolk in small bowl. Whisk 1 tablespoon of Mornay sauce into egg. Fold egg mixture into Mornay sauce. Cover to keep sauce warm.

Spread 1/2 tablespoon butter over one side of each bread slice. Place 4 bread slices on work surface, buttered side down. Divide half of cheese among bread slices. Place ham slices atop cheese, dividing evenly. Top with remaining cheese. Top sandwiches with remaining 4 bread slices, buttered side up.

Heat griddle or cast iron skillet over medium heat. If using a griddle, cook sandwiches until bottom is golden brown and cheese is melted, about 3 minutes per side. If using a cast iron skillet, cook sandwiches until golden brown, about 3 minutes. Turn sandwiches over, then place skillet in 400 degrees F. oven, until golden brown on bottom and cheese is melted, about 5 minutes.

Place sandwiches on a heatproof plate or baking sheet. Spoon 1/4 cup sauce over each sandwich. Broil until sauce is pale golden and bubbles, about 2 minutes. Serve immediately.

Recipe created exclusively for by Nancy Silverton, Chef/Owner of Campanile restaurant and La Brea Bakery.

Recipe reprinted by permission of . All rights reserved.
Date Added: 01/01/2008
Part of These Recipe Collections Find Similar Recipes »
 Hot Crusts: Grilled Sandwiches
Nutrition Facts per Serving
Yield:   4 sandwiches
Calories: 1156
Fat. Total: 78g
Fiber: 4g
Carbohydrates, Total: 49g
Sodium: 2231mg
% Cal. from Fat: 61%
Cholesterol: 316mg
Protein: 68g
Spotlight Recipe Review See all 1 reviews »

Rating: 5
by: Anita Reviewed: 01/13/2014
Easy to make. Sauce is scrumptious. A keeper for sure. Everyone loved it. I couldn't find sliced gruyere so I sliced it myself, didn't work, too crumbly a cheese but used the cut pieces. Used foccacia bread and was perfect.
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