Mushrooms Croque Madame

Ah. The beloved croque monsieur. If you’ve never had the pleasure of enjoying one, a croque monsieur is the best grilled ham and cheese sandwich you could ever wish to consume. Gooey béchamel sauce and swiss cheese layered with ham slices. Not one to conform, I’ve upped the ante and added crispy mushrooms and a fried egg to make it a mushroom croque madame. I think the mushrooms totally make this sandwich.

Recipe and photo by Jenny from The Brunette Baker.

Prep Time: 20 mins | Cook Time: 5 mins | Makes: 1 Sandwich (Béchamel Sauce makes 2 sandwiches)


Béchamel Sauce:
2 tablespoons all purpose flour
4 tablespoons unsalted butter
1 cup whole milk
1 tablespoon prepared yellow mustard
¼ teaspoon nutmeg
⅛ teaspoon each salt and white pepper

Croque Madame:
2 slices soft bread, challah or brioche is preferred
3 tablespoons butter, room temperature and divided
1 cup sliced white mushrooms
4 slices deli-style ham
2 slices swiss cheese
1 egg, fried


Béchamel Sauce:
1. In a medium saucepan over medium heat, melt butter. Add in flour and whisk together. Cook mixture for two minutes, whisking constantly. Flour and butter will begin to bubble up and become “fluffy” in appearance. Very slowly add in milk, whisking until mixture is smooth. It’s very important you do not add milk in all at once or too quickly or you’ll end up with a lumpy sauce. Once milk has been incorporated, cook for four minutes, whisking constantly. Sauce will be very thick and elastic-like, but should be very smooth. Whisk in mustard, nutmeg, and salt.
2. This sauce can be made a day ahead. If you choose to do so, place in a container and cover with plastic wrap directly on top to avoid creating a film or skin. Keep refrigerated.

Croque Madame:
1. In a skillet over medium-high heat, melt one tablespoon of butter. Place sliced mushrooms in a single layer and cook until edges become crispy and golden brown. Remove skillet from heat.
2. Preheat oven broiler to 375 degrees F. Line a baking sheet with parchment paper.
3. Butter each bread slice on one side and place butter side down on baking sheet. Spread a generous amount of béchamel sauce over entire top surface and edges of bread slices. Place baking sheet in oven and bake until sauce begins to bubble. Remove from oven.
4. Top one slice of bread with one slice of swiss cheese, ham slices and 1/2 cup cooked mushrooms. Top with remaining slice of bread, béchamel side up. Place a second slice of swiss cheese on top and remaining mushrooms. Place back under heat until cheese is fully melted and bubbly. Once melted, remove from oven and top with a fried egg.

Note: You may choose to omit the egg for a Croque Monsieur.