Asparagus Tilapia Casserole

I made this up from ideas from a couple of other recipes. I sometimes like to whisk a little skim milk into the soup before pouring on top so that it infiltrates down to the bottom of the pan better. You could sprinkle the top of the soup with bread crumbs but I like it with out and with out the extra calories. Sometimes I also like to add a can of sliced water chestnuts on top of the asparagus for some crunch.