So, I finally tried this and it came out ok, though I can see some adjustments to make.
I added a can of diced tomatoes, half a bag of frozen chopped onions and whole bag of frozen chopped broccoli, plus a garlic Parmesan sauce, about a cup of sour cream, a little cheddar. It was pretty tasty, but a little wetter than I liked. So I think next time, I will reduce the amount of cheese sauce add a combination of grated cheeses and also would add two cans of diced tomatoes but drain them first.
I'll let you know the results when I try it again.