Preheat oven to 350
Cube chicken breasts. Season with garlic salt, salt, and pepper.
Bake chicken at 350 for 20 minutes or until done.
Cook pasta according to directions on box (cook in a large pot.)
After draining the pasta, add it back to a large pot. Add alfredo sauce and milk to the large pot. Mix together.
Add baked chicken into pot with the pasta and sauce. Stir.
Add broccoli to the pot and stir to combine.
At this point, you can put everything in one big baking dish or two smaller dishes for the freezer.
Top dish(es) with parmesan cheese.
To bake, you have three options (see below)
Cover dish with aluminum foil if freezing and write "chicken broccoli alfredo noodle casserole" and the date (this dish is good for 3 months in the freezer).
From Frozen: leave foil on put into cold oven. Set temperature to 350 and let bake for 1 hour, remove foil, and check for doneness 45 minutes later, add time depending on oven and doneness (should be warm throughout and a little brown on the sides).
Thaw from freezer: remove freezer meal from freezer and let thaw overnight (or for 24 hours). Remove foil and bake at 350 for 30 minutes or until brown around edges.