Preheat your oven to 400°F and line a rimmed baking sheet with parchment paper for easy cleanup.
Pound the chicken breast between two pieces of plastic wrap to an even half-inch thickness to ensure uniform cooking.
In one shallow bowl, whisk the egg until smooth; in a second bowl, combine the almond flour, parmesan cheese, oregano, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then dredge thoroughly in the almond flour mixture, pressing firmly to create a thick crust.
Place the breaded chicken on the prepared baking sheet, drizzle with olive oil, and bake for 15 minutes until the coating starts to turn golden.
Remove from the oven and spoon the marinara sauce over the center of the chicken, then sprinkle with the mozzarella cheese.
Return to the oven for an additional 5 to 7 minutes until the cheese is melted and bubbly.
While the chicken finishes, lightly sauté the zucchini noodles in a pan for 2 minutes until just tender, then serve the chicken parmesan directly on top.