I've been making these for a few weeks now and I can't seem to get enough of them! It comes together easily and it a great filling alternative to a loaded, fattening slice of regular pizza. Add whatever veggies you like to personalize this dish. I've always used a pita shell (unsplit) as the crust, but you could probably use a slice of toast or a toasted thin roll instead. I would not recommend using a tortilla because I don't think it would hold up.