Preheat your oven to 400°F and lightly grease a rimmed baking sheet with the olive oil.
In a shallow bowl, whisk the egg until smooth; in a separate shallow dish, combine the almond flour, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Pat the chicken breast dry with a paper towel, dip it into the egg wash to coat, and then dredge it in the almond flour mixture, pressing firmly so the coating adheres.
Place the breaded chicken on the prepared baking sheet and bake for 15 to 18 minutes, or until the internal temperature reaches 165°F.
Remove from the oven, spoon the marinara sauce over the chicken, top with the shredded mozzarella, and broil for 2 to 3 minutes until the cheese is bubbly and golden.
While the chicken rests, quickly sauté the zucchini noodles in a non-stick pan for 2 minutes until just tender, then serve the chicken directly on top.