Carne asada quesadillas is the easiest dinner recipe! With added bell peppers & onions, slow-cooked beef, & cheese, this quesadilla is sure to be a hit! Simply place the flank steak, beer, juices, and seasonings into the crockpot, and let it cook and marinate all day. In the evening, you'll have fall-apart carne asada steak that makes the perfect quesadilla filling! Saute the bell peppers and onions for a healthier quesadilla, then assemble your quesadillas and cook to melted perfection!