Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Place the chicken breast between two sheets of plastic wrap and pound to an even half-inch thickness, then season both sides with sea salt and black pepper.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the panko breadcrumbs, parmesan cheese, garlic powder, and dried oregano.
Dip the seasoned chicken breast into the egg wash, allowing any excess to drip off, then press firmly into the panko mixture until evenly coated on all sides.
Place the breaded chicken on the prepared baking sheet, drizzle with olive oil, and bake for 15 to 18 minutes until the crust is golden and the chicken is cooked through.
Remove from the oven, spoon the marinara sauce over the center of the chicken, and sprinkle with the shredded mozzarella cheese.
Return to the oven under the broiler for 2 to 3 minutes until the cheese is melted and bubbly.
While the chicken rests, lightly sauté the zucchini noodles in a pan for 2 minutes and serve the chicken parmesan directly over the noodles.