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 bowl, combine the panko breadcrumbs, parmesan cheese, oregano, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg wash, letting any excess drip off, then press firmly into the panko mixture until evenly coated on all sides.
Place the breaded chicken on the prepared baking sheet and bake for 15 to 18 minutes until the coating is golden and the chicken is cooked through.
Remove the tray from the oven and spoon the marinara sauce over the center of the chicken, then sprinkle with the shredded mozzarella cheese.
Return the chicken to the oven for 3 to 5 minutes, or until the cheese is bubbly and lightly browned.
While the chicken finishes, heat the olive oil in a skillet over medium heat and sauté the zucchini noodles for 2 to 3 minutes until just tender.
Plate the zucchini noodles and top with the hot chicken parmesan, serving immediately while the crust is perfectly crisp.