INGREDIENTS
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7 tablespoons unsalted butter, plus more for the dish
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Kosher salt
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1 pound elbow macaroni
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1 small onion, finely chopped
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2 stalks celery, finely chopped
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3 cups shredded rotisserie chicken
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2 cloves garlic, minced
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3/4 cup hot sauce (preferably Frank's)
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2 tablespoons all-purpose flour
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2 teaspoons dry mustard
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2 1/2 cups half-and-half
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1 pound yellow sharp cheddar cheese, cut into 1-inch cubes (about 3 1/2 cups)
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8 ounces pepper jack cheese, shredded (about 2 cups)
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2/3 cup sour cream
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1 cup panko (Japanese breadcrumbs)
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1/2 cup crumbled blue cheese
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2 tablespoons chopped fresh parsley