Ingredients
- 4 tablespoons salted butter, plus more for the baking dish
- 1 pound elbow macaroni
- 1 stalk celery, finely diced
- 1/2 head broccoli, stalks largely removed, broken into very small florets
- 1/2 medium onion, finely diced
- 2 tablespoons all-purpose flour
- 1 teaspoon dry mustard
- 2 cups whole milk
- 1 cup chicken or vegetable broth
- 1/4 cup half-and-half
- 2 1/2 cups grated sharp Cheddar
- 1 cup cubed processed cheese, such as Velveeta
- 1 cup grated Parmesan
- Kosher salt and freshly ground black pepper
- 1/2 cup breadcrumbs
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