Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Set up a dredging station with two shallow bowls: in the first, whisk the egg; in the second, combine the almond flour, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, letting any excess drip off, then press firmly into the almond flour mixture until evenly coated on all sides.
Place the coated chicken on the prepared baking sheet and drizzle with the olive oil to help achieve a golden, crispy finish.
Bake for 15-18 minutes, or until the chicken is cooked through and the crust is firm.
Remove from the oven, spoon the marinara sauce over the chicken, and top with the fresh mozzarella slices.
Switch the oven to broil and return the chicken for 2-3 minutes until the cheese is bubbly and slightly browned.
While the cheese melts, lightly sauté the zucchini noodles in a pan for 2 minutes until tender-crisp, then serve the chicken parmesan over the noodles.