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Serve this chicken spaghetti casserole with garlic bread or a simple side salad, and a glass of crisp white wine for the adults.
Place oven rack in middle position. Preheat broiler to LOW. Lightly coat a 9-x 13-inch baking dish with cooking spray.
Cook pasta according to package directions. Drain, reserving 1/2 cup cooking water. Set aside.
Melt butter in a large skillet over medium-low. Add flour and cook, whisking constantly, until bubbling, about 2 minutes.
Increase heat to medium; slowly whisk in milk. Cook, stirring occasionally with a wooden spoon, until sauce thickens, 5 to 6 minutes.
Add cheese and salt and cook, whisking constantly, until smooth, about 2 minutes.
Remove mixture from heat. Stir in chicken, basil, parsley, chives, lemon juice, and cooked pasta. Stir in reserved cooking water as needed to create a creamy sauce.
Spoon mixture into prepared baking dish. Transfer to oven and broil until warmed through, about 4 minutes.
Garnish with additional basil, parsley, and chives. Serve immediately.