Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
In a shallow bowl, whisk the egg until smooth. In a separate shallow dish, combine the almond flour, parmesan cheese, oregano, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg wash, then dredge it through the almond flour mixture, pressing firmly so the coating sticks to all sides.
Place the coated chicken on the prepared baking sheet, drizzle with olive oil, and bake for 15-18 minutes until the crust is golden and the chicken is cooked through.
Remove the chicken from the oven and spoon the marinara sauce over the top, then sprinkle with the shredded mozzarella cheese.
Return the chicken to the oven for 2-3 minutes, or until the cheese is melted and bubbly.
While the chicken rests, spiralize the zucchini into noodles and lightly sauté them in a pan for 2 minutes until just tender.
Serve the crispy chicken parmesan over the warm zucchini noodles and enjoy immediately.