Ingredients
- 8 tablespoons (1 stick) unsalted butter, plus more for casserole
- 6 slices white bread, crusts removed, torn into 1/4- to l/2-inch pieces
- 5 1/2 cups milk
- 1/2 cup all-purpose flour
- 2 teaspoons coarse salt, plus more for water
- 1/4 teaspoon ground nutmeg
- 1/4 teaspoon freshly ground black pepper
- 1/4 teaspoon cayenne pepper
- 4 1/2 cups (about 18 ounces) grated sharp white cheddar cheese
- 2 cups (about 8 ounces) grated Gruyère or 1 1/4 cups (about 5 ounces) grated Pecorino Romano cheese
- 1 pound elbow macaroni
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