Melt 1 tablespoon of butter in pan and saute onions until soft and translucent.
Brown ground beef, drain, and rinse.
In a bowl mix ground beef, onions, BBQ sauce, and bacon.
In a clean pan melt some butter and place your first tortilla down with a little cheddar cheese, beef mixture, and more cheddar cheese followed by another tortilla.
Lightly brown your quesadilla on both sides and serve with more BBQ sauce for dipping, if you'd like.