French Onion Chicken Casserole

0 Heat oven to 350°F.
1 Spray 13x9-inch (3-quart) glass baking dish with cooking spray; set aside.
2 Cook and drain pasta as directed on package.
3 In 12-inch nonstick skillet, heat 1/4 cup butter over medium-high heat.
4 Add onions,  salt and pepper.
5 Cook 11 to 12 minutes, stirring occasionally, until onions are tender.
6 Reduce heat to medium; cook 10 to 12 minutes, stirring occasionally, until onions are starting to brown.
7 Sprinkle flour over onions in skillet; cook and stir about 1 minute.
8 Stir in broth; heat to boiling, stirring constantly.
9 Simmer 1 to 2 minutes or until slightly thickened.
10 Remove from heat; stir in chicken and cooked pasta, mixing to combine.
11 Add half of the mixture to baking dish.
12 Sprinkle with half of the cheese.
13 Top with remaining pasta mixture, then remaining cheese.
14 Cover with aluminum foil and bake 20 minutes.
Topping
16 In small bowl mix the breadcrumbs and melted butter.
17 Remove the aluminum foil, sprinkle with the breadcrumb mixture and bake 10 more minutes, or until crispy and golden brown.