Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Place the chicken breast between two sheets of plastic wrap and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg. In a second shallow bowl, combine the almond flour, half of the parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, then dredge in the almond flour mixture until fully coated, pressing the breading gently to adhere.
Place the chicken on the prepared baking sheet and lightly mist with olive oil. Bake for 15 minutes.
Remove the chicken from the oven, spoon the marinara sauce over the top, and sprinkle with the mozzarella and the remaining parmesan cheese.
Return the chicken to the oven for 5-7 minutes, or until the cheese is melted and bubbly and the chicken is cooked through.
While the chicken finishes, lightly sauté the zucchini noodles in a pan with a splash of water or olive oil for 2-3 minutes until just tender.
Serve the crispy chicken parmesan over the bed of zucchini noodles, drizzling with any extra warm marinara sauce from the pan.