Preheat the air fryer. Set it to 375°F (190°C) for 3–4 minutes.
A preheated basket helps the tortilla get crispy fast.
Prep the tortilla. Spread a thin layer of butter or mayo on one side of a tortilla. This side will face out to brown and crisp in the air fryer.
Build the base. Flip the tortilla so the unbuttered side faces up. Sprinkle a thin, even layer of shredded cheese over half the tortilla.
This bottom layer acts like glue.
Add mac and cheese. Spoon about 1 cup of mac and cheese onto the cheesy half. If your mac is dry, add a tablespoon of milk or a tiny splash of cream to loosen it. Keep the layer even and leave a small border.
Season and customize. Sprinkle a pinch of salt, pepper, and garlic or onion powder if you like.
Add optional mix-ins such as bacon, jalapeños, or chopped broccoli. Keep pieces small so the quesadilla closes neatly.
Top with more cheese. Add another light sprinkle of shredded cheese on top of the mac. This second “glue” layer helps everything hold together.
Fold and secure. Fold the tortilla in half over the filling and press gently.
If your tortilla resists folding, warm it for 10–15 seconds in the microwave first to make it more flexible.
Air fry. Place the quesadilla in the air fryer basket with the buttered side facing down. Brush or spray a little more butter or oil on the top. Cook for 5–7 minutes, flipping once halfway, until the tortilla is golden and the cheese is melted.
Rest and slice. Let it rest 1–2 minutes so the cheese sets slightly.
Slice into wedges with a sharp knife or pizza cutter.
Serve with dips. Pair with ranch, hot sauce, or marinara. Enjoy while hot and crisp.