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 it to an even thickness of about 1/2 inch.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the almond flour, sea salt, black pepper, dried oregano, and garlic powder.
Dip the chicken breast into the egg wash, then dredge it in the seasoned almond flour mixture until evenly coated on all sides.
Place the coated chicken on the prepared baking sheet and bake for 15-18 minutes until the internal temperature reaches 165°F.
Remove the chicken from the oven, spoon the marinara sauce over the top, and sprinkle with both the mozzarella and parmesan cheese.
Return the chicken to the oven for 3-5 minutes, or until the cheese is melted and golden brown.
While the chicken finishes, spiralize the zucchini into thin noodles and sauté them in a pan with olive oil over medium heat for 2-3 minutes until just tender.
Serve the crispy chicken immediately over the bed of warm zucchini noodles.