Preheat your oven to 425°F and line a baking sheet with parchment paper for easy cleanup.
Place the chicken breast between two sheets of parchment and pound to a half-inch thickness for even cooking.
Season both sides of the chicken with sea salt, black pepper, and garlic powder.
In a shallow bowl, whisk the egg; in a second bowl, combine the panko breadcrumbs and dried oregano.
Dip the chicken into the egg wash, then press firmly into the panko mixture until fully coated.
Place the chicken on the baking sheet, drizzle with olive oil, and bake for 15 minutes until the crust is golden.
Spoon the marinara sauce over the chicken, top with mozzarella, and bake for 5 more minutes until the cheese is bubbly.
Briefly sauté the zucchini noodles in a pan until tender, then serve the chicken on top with a garnish of parmesan cheese.