Preheat your air fryer to 375°F (190°C).
Season the chicken breasts with salt and pepper on both sides.
Set up a breading station with three shallow bowls: one with flour seasoned with salt and pepper, one with beaten eggs, and the last with a mixture of panko breadcrumbs and grated Parmesan cheese.
Dredge each chicken breast in the flour, then dip it in the egg wash, and finally coat it in the panko breadcrumb mixture. Press the coating gently to ensure it adheres.
Arrange the breaded chicken breasts in a single layer in the preheated air fryer basket, leaving space between them for even cooking.
Air fry for 6 minutes per side, or until the chicken is golden brown and cooked through (internal temperature should reach 165°F or 74°C).
While the chicken cooks, warm up your marinara sauce.
Once the chicken is cooked, remove it from the air fryer and top each breast with a spoonful of marinara sauce and a sprinkle of mozzarella cheese.
Return the chicken to the air fryer and cook for an additional 2-3 minutes, or until the cheese is melted and bubbly.
Serve your air fryer chicken parmesan immediately with a side of pasta, vegetables, or your favorite dipping sauce.