Thoroughly rinse produce and pat dry.
Coarsely chop or tear romaine lettuce.
Microwave roasted chicken until warmed, 1-2 minutes.
Wrap tortillas in a damp paper towel and microwave until warmed, 1-2 minutes. If tortillas come folded, keep folded.
Place tortillas on a clean work surface. Slather with BBQ sauce, then add cheese, roasted chicken, romaine, and crispy fried onions. Fold sides of tortilla toward center, then roll bottom edge toward the top, enclosing sides tightly. Bon appétit!