Lay tortilla flat. Cut to the center of the tortilla.
Add the cooked ground beef to the quarter directly below the cut.
Add the cheese to the next quarter.
Next add the caramelized onions to the quarter above the cheese.
In the final quarter, add the BBQ sauce.
Now, start folding the sections. First fold the BBQ sauce section over the caramelized onions.
Fold that section over the cheese quarter.
Finally, fold the stacked portion over the beef section.
Repeat these steps with all the tortillas.
Add olive oil or butter to a skillet.
Warm the skillet over medium heat.
Cook the folded quesadillas approx 3 minutes per side to brown the tortilla and make it crispy, and melt the cheese.
Enjoy!