Bring 5 cups water to boil in a saucepan. Add chicken and peppers and simmer for 15 min. Add broccoli during last 10 minutes. Drain.

While the above simmers, prepare the white sauce by placing the butter in a small sauce pot that has been preheated over medium heat. Once the butter melts, add flour and stir for 1 minute. Try not to let the mixture turn brown. Add milk to the mixture and continue to stir until it starts to bubble. Reduce heat and simmer for 10 minutes. Add pepper, Italian seasoning and parmesan cheese to the sauce. Stir to combine. Cook pasta according to directions. While pasta is cooking, preheat oven to 350 degrees.

Drain the pasta. Spray a 9 x 13 pan with nonstick cooking spray.

In a large bowl, combine the pasta with the chicken and chopped vegetables; cover with the sauce. Place in the baking dish. Sprinkle with the Monterey jack cheese and cover with foil.

Bake for 20 minutes; remove foil and continue to bake until cheese is melted.