Croque Monsieur Casserole (Printable Version)

Buttery bread layered with ham, Gruyère, and béchamel sauce baked until golden and bubbly for brunch or dinner.

# What You'll Need:

→ Bread & Dairy

01 - 12 slices white sandwich bread, crusts removed
02 - 2 tablespoons unsalted butter, softened, plus extra for greasing
03 - 1 1/2 cups Gruyère cheese, grated
04 - 1 cup whole milk
05 - 1/2 cup heavy cream
06 - 3 large eggs

→ Meats

07 - 8 slices cooked ham, approximately 7 ounces

→ Béchamel Sauce

08 - 2 tablespoons unsalted butter
09 - 2 tablespoons all-purpose flour
10 - 1 1/4 cups whole milk
11 - 1/4 teaspoon ground nutmeg
12 - Salt and black pepper to taste

# How to Prepare:

01 - Preheat oven to 375°F. Lightly butter a 9x13-inch baking dish and set aside.
02 - In a medium saucepan, melt 2 tablespoons butter over medium heat. Whisk in flour and cook for 1 minute. Gradually whisk in 1 1/4 cups milk, stirring constantly until thickened and smooth, approximately 3 to 4 minutes. Season with nutmeg, salt, and pepper. Remove from heat.
03 - Butter one side of each bread slice. Arrange half the bread slices, buttered side down, in the prepared baking dish.
04 - Top bread with half the ham slices and half the Gruyère cheese. Repeat with remaining bread slices (buttered side down), ham, and cheese.
05 - Whisk together eggs, 1 cup milk, heavy cream, and a pinch of salt in a mixing bowl. Pour evenly over the casserole, pressing gently to soak the bread throughout.
06 - Pour the béchamel sauce over the top layer and spread evenly.
07 - Bake uncovered for 35 to 40 minutes until puffed, golden brown, and bubbling at the edges. Allow to rest for 10 minutes before serving.

# Expert Suggestions:

01 -
  • All the rich, cheesy indulgence of a French bistro sandwich without standing over a skillet flipping bread.
  • It feeds a crowd beautifully and actually tastes better when assembled ahead and baked fresh.
02 -
  • Don't skip the resting time after baking or the custard will run all over the plate instead of holding its shape.
  • If your béchamel gets lumpy, whisk it off the heat vigorously or blend it smooth with an immersion blender.
03 -
  • Press the bread gently into the custard with the back of a spoon so every slice gets fully soaked and bakes evenly.
  • Grate your own Gruyère instead of buying pre-shredded because it melts smoother and tastes sharper without the anti-caking agents.
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