Croque-Monsieur Casserole

Name: Croque-Monsieur Casserole
Prep time: 10 min
Total time: 45 min
Yield: 8 - 10 Servings
Ingredients: Butter, for coating the baking dish; 2 cups whole milk; 7 large eggs; u00be teaspoon freshly ground black pepper; u00bc teaspoon kosher salt; 4 teaspoons Dijon mustard; 12 ounces day-old crusty bread, cut into 10 (u00bd-inch-thick) slices; u00bc cup fresh chives or green onions, chopped; 12 ounces thinly sliced ham; 2 cups grated Gruyu00e8re cheese, divided

By Leslie Blythe Casserole, Cheese, French, Ham Baking

November 8, 2026

Croque-Monsieur Casserole turns the iconic French bistro sandwich into a crowd-pleasing casserole. Instead of buttering and griddling individual sandwiches, bread, salty ham, and rich Gruyère cheese are layered into a casserole dish and baked until bubbly and golden brown. This make-ahead breakfast, brunch, or dinner casserole should make it on your must-make list.

Prep: 10 mins
Cook: 35 mins
Yields: 8 - 10 Servings

Ingredients

Butter, for coating the baking dish

2 cups whole milk

7 large eggs

¾ teaspoon freshly ground black pepper

¼ teaspoon kosher salt

4 teaspoons Dijon mustard

12 ounces day-old crusty bread, cut into 10 (½-inch-thick) slices

¼ cup fresh chives or green onions, chopped

12 ounces thinly sliced ham

2 cups grated Gruyère cheese, divided

Directions

1Generously coat a 9x13-inch baking dish with butter and set aside. Whisk the milk, eggs, pepper, and salt together in a large bowl. Spread the mustard on one side of each slice of bread. Place half of the bread slices Dijon-side up in the baking dish.

2Spoon half of the egg mixture over the bread, making sure that each piece is fully covered. Sprinkle the chives over the bread and egg mixture. Place the ham slices over the bread in an even layer. Sprinkle with half of the Gruyère cheese. Layer with the remaining bread, Dijon-side down. Pour over the remaining egg mixture. Sprinkle with the remaining cheese. Cover and refrigerate for at least 30 minutes or overnight.

3Arrange a rack in the middle of the oven and heat 350°F. Bake uncovered until the egg mixture is set and cheese is bubbly and lightly browned, 35 to 40 minutes. Let stand for 5 minutes.

Recipe adapted from the kitchn.

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