Preheat your air fryer to 390°F | 199°C.
Slice 2 large boneless and skinless chicken breasts in half horizontally to make 4 fillets.
Place the chicken on the cutting board, cover with plastic, or use a zip lock baggie and pound into an even thickness using a rolling pin or meat tenderizer.
In a small bowl mix together 1/4 cup mayonnaise, 1/2 teaspoon onion powder, 1/2 teaspoon basil, 1/2 teaspoon oregano 1/2 teaspoon garlic powder, 1/4 teaspoon of smoked paprika, and salt (optional). Divide the mixture between fillets and spread all over the chicken.
Mix together 1/2 cup panko breadcrumbs and 1 cup fresh grated parmesan cheese in a shallow bowl. Dredge each fillet in the parmesan mixture, pressing lightly into the coating with the tongs. Then turn and repeat. Shake off excess coating.
Place the chicken in the Air Fryer and cook for 10-12 minutes or until golden brown and the internal temperature reaches 165 degrees F. After 5-6 minutes of cooking, carefully flip over the chicken, using tongs.
Garnish with 1 tablespoon fresh oregano or parsley leaves. Enjoy!