Preheat the oven to 425°F (use convection or an air-fryer oven setting if available). Line a baking sheet with parchment paper or spray foil with cooking oil.
Pat the chicken thighs very dry with paper towels to remove excess moisture.
In a mixing bowl combine the grated parmesan, baking powder, Italian seasoning, paprika, garlic powder, salt, and black pepper until evenly mixed.
Rub the seasoning mixture evenly over each chicken thigh, coating all sides.
Arrange the thighs skin-side up on the prepared baking sheet, leaving a few inches between pieces.
Bake for 30–40 minutes (30 minutes is typical for average bone-in thighs); if using boneless thighs start checking at about 25 minutes. The chicken is done when the internal temperature reaches 165°F and juices run clear.
Optionally baste each thigh with pan juices and, for extra crispness, place under the broiler 1–2 minutes—watch closely to avoid burning.