We doubled the recipe and made two casseroles. We used cooked plain white rice on top, and Tex Mex cheese on top instead of parmesan (but would maybe use both next time) and might reduce the first cooking time as the rice dried out a bit. The kids liked it - add seasoning if you like a stronger flavour.
Great combination of flavors and very easy to make. The only thing I changed was on the soup ... the normal cans are only around 305 g so I figured you can't have too much cream of mushroom soup, so I used two cans. This is definitely a keeper.