Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
In a shallow bowl, whisk the egg white until frothy; in a second bowl, combine almond flour, parmesan, garlic powder, oregano, sea salt, and black pepper.
Dredge the chicken breast in the egg white, then press firmly into the almond flour mixture to ensure a thick, even coating.
Place the chicken on the prepared sheet, drizzle with olive oil, and bake for 15 minutes until the crust is golden and firm.
Spoon the marinara sauce over the chicken and top with shredded mozzarella, returning to the oven for 5 minutes until the cheese is bubbly and melted.
While the chicken finishes, lightly sauté the zucchini noodles in a pan for 2 minutes until just tender, then serve the chicken on top.