03Melt butter in a large saucepan over medium heat; sprinkle flour evenly into pan. Cook 2 minutes, stirring constantly with a whisk. Combine milk and soup, stirring with a whisk; then gradually add milk mixture to saucepan, stirring with a whisk. Bring to a boil; cook 2 minutes or until thick. Add ranch dressing and 3/4 cups of cheese, stirring until cheese melts. Stir in pasta and chicken.
04Preheat broiler.
05Spoon pasta mixture into an 8-inch square baking dish coated with cooking spray. Sprinkle evenly with reserved bacon, fried onions and 1/2 cup of cheese. Broil 3 minutes or until cheese melts.