Step 1: Preheat the Air Fryer

1. Set your air fryer to 350°F and let it preheat for 3-5 minutes. This ensures even cooking and perfect crispiness.

Step 2: Prepare the Tortilla

1. Lightly brush olive oil or spray one side of a tortilla with cooking spray.
2. Lay the tortilla flat, oil side down, on a clean surface.

Step 3: Add the Fillings

1. Sprinkle a layer of shredded cheese (about ¼ cup) on half of the tortilla.
2. Add your choice of protein (e.g., shredded chicken, black beans) and vegetables (e.g., spinach, diced peppers).
3. Top with another ¼ cup of shredded cheese to help the tortilla stick together.
4. Fold the tortilla in half to form a semi-circle.

Step 4: Place in the Air Fryer

1. Carefully place the folded tortilla into the air fryer basket, oil side down.
2. If needed, secure the edges with a toothpick to prevent it from opening.

Step 5: Cook the Quesadilla

1. Cook for 4 minutes on one side.
2. Flip the quesadilla gently and cook for an additional 4 minutes, or until golden brown and crispy.

Step 6: Serve and Enjoy

1. Remove the quesadilla from the air fryer using tongs.
2. Let it cool slightly, then cut into wedges.
3. Serve with your favorite dips like guacamole, salsa, or sour cream.