Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Place the chicken breast between two sheets of parchment paper and pound it to an even half-inch thickness.
In a shallow bowl, whisk the egg white until slightly frothy.
In a second shallow bowl, combine the almond flour, parmesan cheese, oregano, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg white, letting the excess drip off, then dredge it through the almond flour mixture until evenly coated.
Place the chicken on the prepared baking sheet and bake for 15-18 minutes until the crust is golden and the chicken is cooked through.
While the chicken bakes, spiralize the zucchini into noodles and lightly sauté them in a pan over medium heat for 2-3 minutes until just tender.
Heat the marinara sauce in a small saucepan until simmering.
Remove the chicken from the oven, top with the marinara sauce and shredded mozzarella, then return to the oven for 2 minutes or until the cheese is melted.
Serve the crispy chicken over the zucchini noodles and enjoy immediately.