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Mushroom Croque-Monsieur

A luxurious French sandwich featuring ham, Gruyère cheese, and a savory mushroom mixture, all topped with a creamy béchamel sauce. This elevated version of the classic croque-monsieur combines earthy mushrooms with melted cheese and crispy bread.

6 servings
40 min
Published October 4, 2025
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Ingredients

  • •1½ tablespoons butter
  • •1½ tablespoons all purpose flour
  • •1½ cups whole milk
  • •1 piece bay leaf
  • •½ cup finely grated Parmesan cheese
  • •1 pinch freshly grated nutmeg
  • •1 dash Hot pepper sauce
  • •8 ounces crimini mushrooms
  • •7 tablespoons butter
  • •2 tablespoons minced shallot
  • •12 slices egg bread
  • •6 slices ham
  • •12 ounces Gruyère cheese
  • •2 tablespoons grated Parmesan cheese
  • •1 garnish Fresh tarragon leaves

Cooking Instructions

  1. 1.

    Melt butter in heavy-medium saucepan over medium heat. Add flour; stir until pale golden, about 2 minutes. Whisk in milk. Add bay leaf. Increase heat to medium-high; whisk until mixture begins to boil. Reduce heat to medium; stir until sauce coats back of spoon, about 5 minutes. Remove from heat. Add cheese and nutmeg. Season with hot sauce, salt, and pepper.

    10 min

  2. 2.

    Place mushrooms in processor. Using on/off turns, process until finely chopped. Melt 3 tablespoons butter in large skillet over medium-high heat. Add mushrooms and shallot; stir until mushrooms are browned and dry, about 8 minutes. Transfer to plate to cool.

    12 min

  3. 3.

    Preheat broiler. Spread remaining butter over 1 side of bread slices. Place bread, buttered side up, on rimmed baking sheet. Broil until golden, watching closely and rotating sheet halfway through broiling, about 3 minutes. Cool bread. Preheat oven to 450°F. Turn 6 bread slices over; top with ham and sliced cheese. Top with remaining bread slices, broiled side up. Press to compress. Spread about 2 tablespoons sauce over sandwiches, leaving 1/3-inch plain border. Divide mushroom mixture atop sauce. Sprinkle with grated Gruyère and Parmesan.

    8 min

  4. 4.

    Bake sandwiches until cheese inside melts and cheese on top turns golden, about 10 minutes. Top with tarragon, if desired.

    10 min

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Language: English
  • English
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