Sprinkle Cajun seasoning or your favorite steak seasoning on both sides of the steak
Place in a greased air fryer basket at 350°F and cook for 6-8 minutes for medium-rare, 8-10 for well done. Once the steak is cooked to your liking, allow it to rest for 5 minutes. This helps to seal the juices in. Then cut the steak into bite-sized pieces. You can cut the steak into bite-size pieces and cook it in the air fryer. However, I like keeping the steak whole if I can so that it locks in the juices in the steak during the cooking process
Spread butter over the entire tortilla in an even layer on a tortilla. This allows the cajun seasoning to stick to it and gives it a nice golden brown color once cooked
Sprinkle the cajun seasoning over the butter and an equal amount of your favorite cheese or whatever you have on hand all over the quesadilla. I use a combination of Mexican blend, mozzarella, and cheddar
Top the cheese with mushrooms, onions, and steak on half of the side of the quesadilla. The cheese will help melt on top of the steak and keep all of the ingredients in place. Fold the tortilla in half
Place in a greased air fryer basket and cook at 350°F for 6-10 minutes. You may want to flip halfway through to ensure both sides of the tortilla cook evenly