Preheat your air fryer to 400°F or your oven to 425°F.
Place the chicken breast between two sheets of parchment paper and pound it to an even half-inch thickness for uniform cooking.
In a shallow bowl, whisk the egg white until it becomes slightly frothy.
In a separate shallow dish, combine the almond flour, parmesan cheese, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg white to coat, then press it firmly into the almond flour mixture until both sides are well-encrusted.
Lightly coat the air fryer basket with olive oil, place the chicken inside, and cook for 10-12 minutes, flipping halfway through, until the exterior is golden and crispy.
Spoon the marinara sauce over the chicken and sprinkle with the shredded mozzarella; cook for an additional 2 minutes until the cheese is bubbly and melted.
Briefly sauté the zucchini noodles in a separate pan for 2 minutes until just tender, then serve the crispy chicken parmesan directly on top.