Chicken stock sounds okay but I'd nix the beef... beef with chicken
stock is a definite TIAD... use the meat from the chicken legs
instead. For substance add some diced potatoes or better, some egg
noodles... cook the noodles seperately or they'll suck up much of your
stock. Could use diced carrot and celery too, and some curly leaf
parsley and dillweed.
Consider the beef round for a beef barley 'shroom soup...start by
dicing and browning the beef.