Preheat your oven to 400°F (200°C) and place a wire cooling rack over a baking sheet lined 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 panko breadcrumbs, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken into the egg wash, then press firmly into the panko mixture until fully and evenly coated.
Place the chicken on the wire rack and bake for 15-18 minutes until the crust is golden and the internal temperature reaches 165°F.
Remove from the oven, spoon the marinara sauce over the chicken, and top with shredded mozzarella and grated parmesan.
Switch the oven to broil and return the chicken for 2-3 minutes until the cheese is bubbly and slightly browned.
While the cheese melts, spiralize the zucchini and sauté it in a dry pan for 2 minutes until just tender.
Serve the crispy chicken immediately over the bed of zucchini noodles.