chicken divan healthier

i wanted broccoli and cheese and mushrooms, but no heavy sauce. so i did this:

browned 8 oz of sliced mushrooms
half a medium onion
in 1 T butter. well, or 2.
salt and peppered.
moved them to the side and added two skinless chicken breasts, sliced. browned them.

placed browned chicken in a pam sprayed baking dish with a lid.
cut up fresh broccoli and added that to the dish on top of the chicken.

to 4 oz of greek yogurt, added gorgonzola crumbles and shredded cheddar and mushrooms. poured this over the chicken and broccoli. topped with shredded parmesan. baked covered till bubbly, abt 30 min at 350. removed top and browned 15 minutes. the "sauce" was watery, so I drained that, reduced it and added a teaspoon of cornstarch, reduced more. poured this over the dish and heated another 5 minutes.