Preheat your oven to 400°F (200°C) and line a rimmed baking sheet with parchment paper for easy cleanup.
Place the chicken breast between two sheets of plastic wrap and gently pound with a meat mallet to an even half-inch thickness.
In a shallow bowl, whisk the egg white until it becomes slightly frothy and light.
In a second 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, letting any excess drip off, then press it firmly into the almond flour mixture until thoroughly coated on both sides.
Transfer the breaded chicken to the prepared baking sheet and drizzle the olive oil evenly over the top to help it crisp up.
Bake for 15 to 18 minutes, or until the chicken is cooked through and the crust has turned a beautiful golden brown.
Remove from the oven, spoon the marinara sauce over the center of the chicken, and sprinkle with the shredded mozzarella cheese.
Switch the oven to the broil setting and return the chicken for 2 to 3 minutes until the cheese is melted, bubbly, and slightly browned.
While the chicken broils, quickly sauté the zucchini noodles in a dry pan for 2 minutes until just tender, then serve the chicken parmesan immediately on top.