I'm amazed that Chipotle hasn't packaged it's online ordering app and licensed it to other restaurants. I've never used such a streamlined, polished, and convenient way to make an order for pickup or delivery.
Panera and Chipotle are about as far apart as you can get, sandwiches and soups versus burritos and burrito bowls yet where I see some alignment is how they both have amazing online ordering experiences which allow deep order customization that eschews a lot of friction in doing so. I can’t think of another large chain with similar order experience between the two (Edit: Potbelly, perhaps for sandwiches?)