No, I don't think anyone needs a recipe for a quesadilla. All you need to do is melt cheese in a tortilla. You can make them in the microwave, under the broiler or in a skillet. (My roommate last year actually had a designated quesadilla maker.) You can keep them cheese-only, fill them with extras or put all the fun stuff on top. To each his own, really.
But let me tell you about my own.
My favorite quesadilla starts with a hot cast iron pan. With a little olive oil, I cook sweet bell peppers, onions, mushrooms and diced jalapeno. Salt and pepper. I push that to the side and lay down a tortillla…ideally it is a Trader Joe's Truly Handmade tortilla. I add shredded Monterey Jack (not a ton) and put the vegetables on top to melt the cheese faster. When the cheese is gooey and the tortilla slightly crisp, I slide it on a plate, squeeze fresh lime juice all over and fill the quesadilla with cilantro before folding it in half. Depending on the day, I might also smother the whole thing with sour cream.
download adobe master collection cs6
So, no, you don't need a recipe for a quesadilla. But if you were looking for some inspiration, just gaze at that photo a little longer.