I think? Mostly toppings, cheeses, sauces, bun etc. I think they had chicken or maybe a veggie burger, I don't remember.
I wouldn't go on my own if I wanted a burger, but if I had a coupon or if thats where people I was with wanted to go, I wouldn't NOT go, but there's better < $10 burger meals out there. I didn't like their fries, but the milkshakes were ok.