How to Make Croque Monsieurs
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Prep time 15mins
Cook time 30mins
Serves or Makes: 6 sandwiches

Recipe Card


  • 1/4 cup butter
  • 1/4 cup all-purpose flour
  • 3 cups whole milk
  • 2 garlic cloves, finely grated
  • 1 sprig sage
  • 1 sprig thyme
  • 2 cups grated Gruyere, divided
  • 1 cup grated Parmesan, divided
  • 1 teaspoon lemon zest
  • Pinch of nutmeg or cardamom (optional)
  • Kosher salt, to taste
  • 12 slices sourdough bread
  • 18 thick-cut slices ham


  • Step 1

    Preheat oven to 425°F. In a medium saucepan, melt butter oven medium heat, then stir in flour to make roux. Slowly whisk in milk; add herbs and garlic. Cook until thickened, 5 minutes. Stir in half of the cheeses with lemon zest, nutmeg/ cardamom (if using) and salt. Let cool.

  • Step 2

    Spread béchamel on all both sides of each slice of bread. Layer with ham and a sprinkle of cheese. Sandwich and top with any remaining cheese. Place on a parchment lined sheet pan, then bake until golden and bubbling, 20-25 minutes. Serve immediately!