"Chicken breasts, broccoli, and mushrooms are smothered in a creamy Mornay sauce and topped with a blanket of cheesy breadcrumbs in this classic casserole...."
INGREDIENTS
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1 bunch broccoli (1 1/2 pounds), cut into florets (about 5 cups)
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Kosher salt and freshly ground pepper
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4 tablespoons unsalted butter, plus 2 tablespoons melted
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1 1/2 pounds boneless, skinless chicken breast, cut crosswise into 1/2-inch-thick strips
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1 small onion, finely chopped (1 cup)
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8 ounces cremini mushrooms, sliced (about 2 1/2 cups)
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3 tablespoons unbleached all-purpose flour
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3 cups whole milk, room temperature
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9 ounces shredded medium-sharp cheddar (3 cups)
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2 teaspoons Dijon mustard
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1 teaspoon Worcestershire sauce
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1/8 teaspoon cayenne pepper
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1/2 cup sour cream
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1 cup panko breadcrumbs
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Cooked egg noodles or steamed white rice, for serving