Mushroom Croque-Monsieur Recipe | Epicurious

Ingredients

• 1 1/2 tablespoons butter
• 1 1/2 tablespoons all purpose flour
• 1 1/2 cups whole milk
• 1 bay leaf
• 1/2 cup finely grated Parmesan cheese
• Pinch of freshly grated nutmeg
• Hot pepper sauce
• 1 8-ounce package crimini (baby bella) or button mushrooms, trimmed
• 7 tablespoons butter, room temperature, divided
• 2 tablespoons minced shallot
• 12 1/3-inch-thick slices egg bread
• 6 thin ham slices
• 12 ounces Gruyère cheese; 9 ounces thinly sliced, 3 ounces grated
• 2 tablespoons grated Parmesan cheese
• Fresh tarragon leaves (optional)