Preheat the air fryer to 370°F (about 188°C).
In a medium bowl, combine smoked paprika, garlic powder, onion powder, chili powder, Italian dried herbs, ground cumin, ground mustard, and very finely grated Parmesan; mix well.
Place the chicken thighs in a large bowl and toss with the olive oil until lightly coated.
Add the seasoning mix to the oiled chicken and toss thoroughly so each piece is evenly coated; season with salt and pepper to taste.
Arrange the thighs in a single layer in the air fryer basket, skin side down, leaving 1–2 inches between pieces for air circulation.
Cook for 15 minutes, then flip each thigh and continue cooking for an additional 10–15 minutes, or until the internal temperature reaches 165°F (74°C) and the skin is crispy.
Remove from the air fryer and serve topped with fresh parsley and your favorite dipping sauce.