In a medium bowl, mix the shredded chicken, Buffalo wing sauce, ranch dressing, kosher salt, garlic powder, onion powder, cayenne (if using), and grated Monterey Jack until evenly combined.
Divide the filling into 6 equal portions.
Lay a tortilla flat and place one portion of filling in the center; roll tightly and secure with a toothpick. Repeat with remaining tortillas.
Lightly mist or brush each taquito with olive oil or cooking spray and place seam-side down in a single layer in the air fryer basket. Cook in batches if needed.
Air fry at 380°F for 8–12 minutes, or until taquitos are golden and crisp.
Remove toothpicks, sprinkle with chopped green onions if desired, and serve with extra ranch for dipping.