Ingredients
- Kosher salt and freshly ground black pepper
- 1 pound elbow macaroni
- 6 tablespoons unsalted butter, plus more for the casserole dish
- 1 yellow onion, chopped
- 2 stalks celery, chopped
- 2 tablespoons all-purpose flour
- 3 1/2 cups half-and-half
- 4 cups shredded Cheddar
- 2 cups shredded Monterey Jack cheese
- 1/2 cup crumbled blue cheese
- 1 1/3 cups hot sauce
- 1 cup panko breadcrumbs
- 2 scallions, sliced on the bias
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