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Croque Monsieur Breakfast Casserole on a plate
Melissa Hart

Croque Monsieur Breakfast Casserole

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Prep Time 25 minutes
Cook Time 40 minutes
Total Time 1 hour 5 minutes
Servings: 8
Ingredients Method

Ingredients
  

  • 12 slices sturdy white sandwich bread
  • 2 tbsp Dijon mustard
  • 10 oz thinly sliced fully cooked ham
  • 8 oz Gruyere shredded, divided
  • 3 tbsp unsalted butter
  • 3 tbsp all-purpose flour
  • 2 1/2 cups whole milk
  • 1/4 tsp kosher salt
  • 1/4 tsp black pepper
  • 1/8 tsp ground nutmeg

Method
 

  1. Heat oven to 400°F. Toast bread on sheets 5 minutes per side until dry and lightly golden.
  2. Melt butter in saucepan over medium. Stir in flour 1 minute; gradually whisk in milk. Simmer 4 minutes until smooth and lightly thickened; add salt, pepper, and nutmeg.
  3. Spread 1/2 cup sauce in 9-by-13-inch dish. Spread toast with mustard; make six sandwiches with ham and 5 ounces Gruyere. Halve; arrange snugly in dish.
  4. Pour remaining sauce over sandwiches; top with remaining Gruyere. Bake 15 to 20 minutes until bubbling and middle filling 165°F.
  5. Broil 1 to 2 minutes, watching constantly, until cheese brown-blistered. Rest 10 minutes; divide into eight portions.