Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Place the chicken breast between two pieces of plastic wrap and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the almond flour, parmesan cheese, garlic powder, and dried oregano.
Season the chicken breast with sea salt and black pepper on both sides.
Dip the chicken into the egg wash, letting the excess drip off, then press firmly into the almond flour mixture until fully coated.
Place the breaded chicken on the prepared baking sheet and drizzle with olive oil.
Bake for 15-18 minutes until the chicken is cooked through and the coating is golden brown.
Remove from the oven, spoon the marinara sauce over the chicken, and sprinkle with the mozzarella cheese.
Return to the oven under the broiler for 2-3 minutes until the cheese is melted and bubbly.
While the chicken rests, quickly sauté the zucchini noodles in a pan for 2 minutes until just tender, then serve the chicken parmesan over the noodles.