Marinate the Chicken: In a medium bowl, combine the chicken tenders and buttermilk. Ensure the chicken is fully submerged and let it marinate in the refrigerator for at least 30 minutes or up to overnight (for maximum tenderness).
Prepare the Breading: In another bowl, mix together the all-purpose flour, garlic powder, onion powder, smoked paprika, salt, black pepper, oregano, and cayenne pepper, if using.
Coat the Chicken: Remove the chicken from the buttermilk and let any excess drip off. First, dredge each tender in the flour mixture, shaking off excess. Next, dip it back into the buttermilk, and then coat it evenly with breadcrumbs, pressing lightly to adhere.
Preheat the Air Fryer: Preheat your air fryer to 400°F (200°C) for about 5 minutes while you finish breading the chicken.
Arrange in Air Fryer: Spray the air fryer basket lightly with cooking spray. Place the breaded chicken tenders in the basket in a single layer, making sure they do not overlap. You may need to do this in batches depending on the size of your air fryer.
Air Fry the Chicken: Lightly spray the tops of the chicken tenders with cooking spray to help them crisp up. Cook for 10-12 minutes, flipping halfway through, until they are golden brown and cooked through (internal temperature should reach 165°F or 74°C).
Serve: Once done, remove the chicken tenders from the air fryer, sprinkle with fresh parsley if desired, and serve with lemon wedges on the side. Pair with your favorite dipping sauce, like honey mustard or ranch.