Gluten-Free Croque-Monsieur

Gluten-Free Croque-Monsieur

Prep Time 20 minutes
Cook Time 15 minutes
Total Time 35 minutes
Servings 4 sandwiches


  • 8 slices gluten-free white sandwich bread homemade or store-bought
  • 2 tablespoons unsalted butter (1 ounce; 28 grams)
  • 3 tablespoons sweet rice flour (3/4 ounce; 22 grams)
  • 2 1/2 cups whole or 2% milk, warmed (10 ounces; 283 grams)
  • 1/4 teaspoon salt
  • 1/2 teaspoon freshly ground black pepper
  • 2 cups Gruyère cheese, grated (about 8 ounces; 226 grams)
  • 1/4 cup freshly grated parmesan cheese (about 1 ounce; 28 grams)
  • Dijon mustard
  • 1/2 pound thinly sliced ham


  1. Preheat the oven to 425ºF. Place the bread on an 18 by 13-inch rimmed baking sheet. Bake, flipping once, until the slices begin to turn golden brown. Remove from the oven and set aside. Leave the oven on.
  2. Prepare the sauce: In a small pot, melt the butter. Add the sweet rice flour. Cook for 3 minutes, whisking constantly. The paste will turn a light golden brown. In a slow and steady steam, add the milk. Cook, whisking constantly, until the sauce begins to bubble. Season with salt and pepper. Stir in 1/4 cup of the Gruyère and all of the parmesan. Whisk until smooth.
  3. Make the Sandwiches  Spread a thin coat of mustard on each piece of bread. Place a few slices of ham and a generous sprinkle of Gruyère on each of 4 bread slices. (Reserve about one-quarter of the cheese.) Top with a second slice of bread, mustard side down. Place sandwiches on a baking sheet. Spoon a generous amount of white sauce onto each sandwich. Divide the remaining Gruyère over the top.

  4. Return the sandwiches to the oven. Bake for 5 minutes to heat.
  5. Turn on the broiler. Broil until the cheese is melted, light brown, and bubbling. Serve immediately.