Three-Cheese Chicken Broccoli Spaghetti Squash Bake

spaghetti squash (halved and baked at 400F 40 minutes until tender)

chicken breasts (cut into 1-in cubes)

medium onion (finely diced)

garlic (minced)

fresh broccoli florets

butter

white whole wheat flour

milk

half-and-half cream

grated Parmesan cheese

Salt and pepper

shredded mozzarella cheese

shredded sharp cheddar cheese

minced fresh parsley