Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
In a shallow dish, whisk the egg white until it becomes slightly frothy.
In a separate shallow bowl, combine the almond flour, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg white, ensuring it is fully coated, then dredge it through the almond flour mixture, pressing firmly so the coating sticks.
Place the coated chicken on the prepared baking sheet and bake for 15 to 18 minutes until the internal temperature reaches 165°F.
Remove from the oven, spoon the marinara sauce over the chicken, and sprinkle with the mozzarella cheese.
Return to the oven and broil for 2 to 3 minutes until the cheese is melted and bubbly.
While the chicken rests, sauté the zucchini noodles in a pan with olive oil for 2 minutes until just tender, then serve the chicken over the noodles.