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, dried oregano, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then dredge it through the almond flour mixture until evenly coated on all sides.
Place the breaded chicken on the prepared baking sheet and bake for 15 to 18 minutes, or until the internal temperature reaches 165°F.
Remove the chicken from the oven and top with the marinara sauce, followed by the shredded mozzarella and parmesan cheese.
Return the chicken to the oven for an additional 3 to 5 minutes until the cheese is melted and slightly bubbly.
While the chicken finishes, heat the olive oil in a skillet over medium heat and sauté the zucchini noodles for 2 minutes until just tender.
Serve the crispy baked chicken immediately over the bed of warm zucchini noodles.