Preheat the air fryer to 400°F (if your model requires preheating).
In a bowl, toss the diced cooked chicken with the 1/4 cup Buffalo sauce until evenly coated.
Place 4 cups of Doritos in an even layer in the bottom of the air fryer basket.
Top the Doritos with the Buffalo-coated chicken, then sprinkle 1 cup shredded cheese evenly over the top.
Air fry at 400°F for about 8 minutes, or until the cheese is melted and the chicken is heated through; check once to ensure chips are not burning.
Carefully remove the nachos from the air fryer, drizzle with 3 tablespoons blue cheese dressing, and garnish with chopped fresh cilantro before serving.
