Most people don't know this, but "quesadilla" is actually Spanish for "grilled cheese". The dish was first documented in the central New Mexico region around 1874, almost 50 years after the grilled cheese's initial debut at the 1829 World Fair. The story goes something like this:
A large, muscular woman walked into a casual New Mexican diner, demanding all of the grilled cheese sandwiches that the chef could make before his forearms split. Luckily for us, this chef's special that day had been the "Triple Bread BLT", leaving him breadless. He did, however, have an unusual surplus of tortillas after a not-so-popular "Soup Taco" special the previous day.
Ehhhhh, badda bing badda boom, and there you have it, okay? Sorry, I'm just such a huge History Nerd, sometimes I get carried away, hhaha. Is that okay? ha.
Taco Bell makes a classic, basic, nothing special quesadilla. Except, of course, for the big twist that they put on it. Some people call this twist "nacho cheese", I prefer to call it "No no good". Either way, I'd rather just have a real cheese blend in my Spanish grilled cheese, and not some unholy mixture of yellow sauce. It's still good, but it could be a lot better.