Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg until smooth. In a second bowl, combine the almond flour, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then press firmly into the almond flour mixture to coat both sides.
Heat the olive oil in a non-stick skillet over medium heat. Once hot, add the chicken and cook for 4-5 minutes per side until the crust is golden brown and the chicken is cooked through.
Spread the marinara sauce over the chicken and sprinkle with mozzarella and parmesan cheese. Cover the pan with a lid for 1-2 minutes until the cheese is melted and bubbly.
In a separate pan or the same skillet after removing the chicken, lightly sauté the zucchini noodles for 2 minutes until just tender.
Serve the crispy chicken parmesan immediately over the zucchini noodles.