There are many cabbage casserole recipes that call for cooked ground beef.  So, if you're interested in a more hearty cabbage casserole that's also a meal, add 1 pound cooked and drained ground beef (or sausage) to the casserole before baking. I would also suggest adding 1/2 cup beef broth to ensure the casserole doesn't get dry from the beef.  Bake as directed.