Preheat your air fryer to 400°F.
In a shallow bowl, whisk the egg until well beaten.
In a separate shallow bowl, whisk together the almond flour, parmesan cheese, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then press it firmly into the almond flour mixture until evenly coated on both sides.
Place the breaded chicken in the air fryer basket and cook for 12 to 15 minutes, flipping halfway through, until the internal temperature reaches 165°F.
Spoon the marinara sauce over the chicken and top with the mozzarella cheese.
Air fry for an additional 2 minutes until the cheese is melted and bubbly.