1. Preheat broiler.
2. Bring 6 quarts water and 1 tbl salt to a boil. Add pasta; cook 8 mins or until al dente; drain.
3. Combine flour and 1/2 cup milk in a sauce pan over med heat. Gradually add 1 cup milk; bring to a boil. Cook 1 min, stirring constantly. Remove from heat; let stand 4 mins or until ot cools to 155 degrees. Stir in 1 1/2 cups cheese. Add 1/4 tsp salt, onions, hot sauce, pepper, and bacon; stire. Add pasta; toss. Spoon into a 2 quart broiler-safe dish coated with cooking spray; top with 12 cup cheese. Broil 7 mins.
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