Gluten Free Croque Monsieur

Why You’ll Love This Recipe

I love how this recipe gives new life to leftover gluten free bread and transforms it into something luxurious. The creamy white sauce adds an elegant twist, while the gooey Swiss cheese and crispy grilled bread make each bite incredibly satisfying. Whether it’s a weekend brunch or a special lunch, this gluten free Croque Monsieur never disappoints.

ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

White Sauce

2 tablespoons butter

1 tablespoon cornstarch (increase to 1½ tablespoons if a thicker sauce is desired)

¼ teaspoon salt

⅛ teaspoon pepper

1 cup milk (1% or higher)

Sandwiches

8 slices gluten free white bread (or any gluten free sandwich bread)

Butter for both sides of the bread

4 slices ham

Dijon mustard

Sliced Swiss cheese (Gruyère or Emmenthal)

Finishing

½ cup grated Swiss or Parmesan cheese

directions

Make the White Sauce:
In a small saucepan, melt the butter over medium heat. Add cornstarch, salt, and pepper, and whisk until smooth. Slowly pour in a third of the milk, stirring occasionally until the mixture thickens. Add the second third of the milk and stir again until thick. Finish with the final third, cooking until the sauce is thick and smooth. Remove from heat.

Prepare the Sandwiches:
Lay out the bread and assemble 4 sandwiches. Butter the outside of each slice. On the inside, spread Dijon mustard, layer with ham, and top with sliced Swiss cheese. Close the sandwiches.

Grill the Sandwiches:
Heat a griddle or non-stick frying pan. Grill the sandwiches on both sides until golden brown and the cheese inside is melted.

Finish Under the Broiler:
Preheat the broiler. Place grilled sandwiches on a lined baking sheet. Spread a layer of the warm white sauce on top of each sandwich and sprinkle with grated cheese. Broil until the top is golden and bubbly. Serve immediately.

Servings and timing

Servings: 4 sandwiches
Prep Time: 5 minutes
Cook Time: 15 minutes
Total Time: 20 minutes

Variations

I sometimes use turkey or roast chicken instead of ham for a different protein.

For a vegetarian version, I skip the ham and add sautéed mushrooms or spinach inside the sandwich.

I like using sharp cheddar or a blend of cheeses if I want a more robust flavor.

To make it dairy free, I use plant-based butter, milk, and cheese, and it still turns out creamy and satisfying.

storage/reheating

These sandwiches are best served fresh, but if I have leftovers, I store them in an airtight container in the fridge for up to 2 days. I reheat them in a toaster oven or under the broiler to keep the exterior crisp. Microwaving works in a pinch but softens the bread.

FAQs

Can I make the white sauce ahead of time?

Yes, I often prepare the white sauce a day in advance and store it in the fridge. I just reheat it gently on the stove before spreading it on the sandwiches.

What’s the best gluten free bread for this recipe?

I prefer a sturdy gluten free sandwich bread that holds up well to grilling, like a white or sourdough-style loaf. It should be firm enough not to fall apart when layered and grilled.

Can I freeze these sandwiches?

I don’t recommend freezing fully assembled Croque Monsieur sandwiches, but I sometimes freeze the white sauce separately and use it for a quick future batch.

How do I keep the sauce from getting lumpy?

I pour the milk in gradually and whisk constantly between additions. If it still clumps, I strain it before using, but that’s rarely needed if I take my time.

What can I serve with Croque Monsieur?

I like to pair it with a crisp green salad, some pickles, or a light soup. It also makes a fantastic brunch dish alongside roasted potatoes or fresh fruit.

Conclusion

This Gluten Free Croque Monsieur is a true celebration of classic French flavor made accessible for gluten free eaters. With its golden crust, creamy sauce, and melty cheese, it’s hard to believe something this indulgent is so easy to make. I come back to this recipe any time I want something quick, satisfying, and a little bit fancy

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