Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Slice the chicken breast into even-thickness cutlets and pat them thoroughly dry with a paper towel.
In a shallow bowl, whisk the egg white until it becomes slightly frothy.
In a second shallow bowl, combine the almond flour, grated parmesan, dried oregano, garlic powder, sea salt, and black pepper.
Dip each chicken cutlet into the egg white, letting any excess drip off, then press firmly into the almond flour mixture to coat both sides.
Place the coated chicken on the prepared baking sheet, drizzle with olive oil, and bake for 15-18 minutes until the crust is golden and the chicken is cooked through.
Spoon the marinara sauce over each piece of chicken and sprinkle with the shredded mozzarella cheese.
Return the chicken to the oven for an additional 3-5 minutes, or until the cheese is melted and bubbly.
While the cheese melts, spiralize the zucchini and lightly sauté it in a non-stick pan over medium heat for 2 minutes until just tender.
Serve the crispy baked chicken immediately over the bed of warm zucchini noodles.