Butter one side of your large tortilla, or 1 side of each small tortillas.
Once preheated place 1 tortilla in and hold one end while you fill half of the large tortilla with your shredded cheese and salsa.
Fold other half over (or put 1 small tortilla on bottom with buttered side down, fill with cheese and place 2nd small tortilla on top with buttered side facing up)
Close air fryer lid and cook for 4 minutes or until it is as crispy as you'd like on the outside. Check after minute 1 to ensure the top half hasn't shifted, sometimes using large tortillas it opens and you need to close again after a minute a push down on melted cheese so it stays the rest of the time.
Use a pizza cutter to slice into 3 - 4 pieces and enjoy.