Once she decided Carl’s Jr. wasn’t good anymore, my mother liked Whataburger. It was originally a Texas chain, or at least that’s where we encountered it, but it got to Oklahoma in the 90s.
This will be very odd to mention, but What-A-Burger has really good salads... nice mixed greens, cherry tomatoes, shredded cheese... I would get the side salads with no dressing and just eat it with my fingers as a snack.