Culver's is definitely my top contender.

Taco John's is a good one. I loved their chicken avacado bacon taco. $2 and half a dozen later never had a regret. Until it went away.

A&W is hit or miss as long as they still have their root beer tapped in store.

Kwik Trip is popular too because it's literally grab and go or call ahead and it's made for you. You can customize it without extra cost is a big win. Burgers. Pizza. Grab some donuts and breakfast sausage and the ultimate diabtus sandwhich is made for breakfast.