Herbed Prosciutto and Gruyere Croque Monsieurs

Elevate your sandwich game with these luxurious Herbed Prosciutto and Gruyere Croque Monsieurs—a decadent twist on the French bistro classic. Golden, crispy bread cradles layers of thinly sliced prosciutto, Dijon mustard, and nutty Gruyere cheese, while fresh thyme and parsley add a fragrant, herby touch. The pièce de résistance? A creamy Mornay sauce blanketing each sandwich and bubbling to perfection under the broiler. Perfect for brunch, lunch, or an indulgent dinner, this recipe combines bold flavors and textures in just 40 minutes. Whether you're entertaining guests or enjoying a cozy meal at home, these Croque Monsieurs deliver gourmet flair with every bite.

Nutriscore Rating: 51/100

Prep Time:15 mins

Cook Time:25 mins

Total Time:40 mins

Servings: 4

Ingredients

• 4 tablespoons Unsalted butter
• 2 tablespoons All-purpose flour
• 1.5 cups Whole milk
• 0.125 teaspoons Nutmeg, freshly grated
• 1 teaspoons Salt
• 0.5 teaspoons Freshly ground black pepper
• 2 cups Gruyere cheese, grated
• 8 slices Loaf of rustic white bread, sliced thickly
• 4 tablespoons Dijon mustard
• 8 slices Prosciutto, thinly sliced
• 1 teaspoons Fresh thyme, chopped
• 1 tablespoons Fresh parsley, chopped
• 0.5 cups Shredded Gruyere for topping

Directions

Step 1

Preheat your oven to 375°F (190°C).

Step 2

In a medium saucepan, melt 2 tablespoons of butter over medium heat. Once melted, whisk in the flour to create a roux and cook for 1 minute.

Step 3

Gradually pour in the milk, whisking constantly to avoid lumps. Cook for 2-3 minutes until the sauce thickens.

Step 4

Season the sauce with nutmeg, salt, and pepper. Remove from the heat and stir in 1/2 cup of grated Gruyere until melted. Set aside. This is your Mornay sauce.

Step 5

Lay out the slices of bread. Spread 1/2 tablespoon of Dijon mustard on one side of 4 slices of bread.

Step 6

On top of the mustard-covered slices, layer 2 slices of prosciutto, a sprinkle of thyme, parsley, and 1/4 cup of grated Gruyere. Top with another slice of bread to form a sandwich.

Step 7

Heat a large skillet over medium heat. Melt 1 tablespoon of butter in the pan and grill the sandwiches in batches for 2-3 minutes per side, until they are golden brown. Add more butter as needed for subsequent batches.

Step 8

Transfer the grilled sandwiches to a baking sheet lined with parchment paper.

Step 9

Ladle a generous amount of Mornay sauce over each sandwich and sprinkle with additional Gruyere cheese.

Step 10

Bake in the preheated oven for 10-12 minutes, or until the tops are bubbly and golden brown.

Step 11

Remove from the oven and let cool slightly before serving.

Nutrition Facts

Serving size	(1540.7g)

Amount per serving	% Daily Value*
Calories	3838.0

Total Fat 198.5g	0%
Saturated Fat 99.3g	0%
Polyunsaturated Fat 0.4g
Cholesterol 507.3mg	0%
Sodium 11408.9mg	0%
Total Carbohydrate 334.7g	0%
Dietary Fiber 9.0g	0%
Total Sugars 34.5g
Protein 173.0g	0%

Vitamin D 186.5IU	0%
Calcium 3884.1mg	0%
Iron 19.8mg	0%
Potassium 1849.2mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 46.8%

Protein: 18.1%

Carbs: 35.1%