"Feed a crowd with a baked take on the classic French Croque Madame sandwich with smoky ham, melty cheese, creamy sauce, and gently cooked eggs. Serve with a crisp green salad for a lovely brunch, lunch, or dinner...."
INGREDIENTS
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12 (3/4"-thick) slices day-old white bread, such as Pullman, pain de mie, or country bread (a square-shaped loaf works best)
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6 tablespoons unsalted butter
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3 tablespoons all-purpose flour
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3 cups whole milk
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1/4 teaspoon freshly grated or ground nutmeg
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1 1/4 teaspoons kosher salt, divided
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1/2 teaspoon freshly ground black pepper, divided
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3 1/4 cups grated Gruyère (about 10 ounces), divided
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1/4 cup Dijon mustard
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12 thin slices Black Forest ham (about 10 ounces)
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6 large eggs
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Nonstick vegetable oil spray