Cook and crumble ground beef in a skillet. Drain fat then add onions. Allow to cook for 1-2 minutes then add ketchup, mustard, Worcestershire sauce, and bacon bits. Mix until well combined. Set aside.
Add flour tortilla to a skillet and top with burger filling and top with shredded cheese. Place another tortilla on top and cook until cheese is melted. Flip and cook for another 30 seconds -1 minute.