Fast and easy. Barbecue sauce makes a delicious change from the usual seasoned tomato sauce. I use Yves brand Veggie Ground Round Original and President's Choice Tournament BBQ Sauce (available only in Canada, I believe). To cut prep and cleanup time, I sometimes use a pre-shredded blend of cheeses. Meat eaters can substitute any ground meat for the veggie burger (I brown 1 pound of lean ground beef or chicken and freeze it in single-serving portions). Use whatever veggies you have on hand instead of, or in addition to, mushrooms.