Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Place the chicken breast between two sheets of parchment paper and gently pound with a meat mallet until it is an even half-inch thickness.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the panko breadcrumbs, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, coating both sides, then dredge it through the panko mixture, pressing firmly to ensure the breading adheres.
Place the chicken on the prepared baking sheet and lightly mist with olive oil spray. Bake for 12-15 minutes until the crust is golden and the chicken is nearly cooked through.
Remove the tray from the oven. Spoon the marinara sauce over the center of the chicken, then top with the shredded mozzarella and grated parmesan.
Return the chicken to the oven and bake for an additional 3-5 minutes, or until the cheese is bubbly and slightly browned.
While the chicken finishes, heat the olive oil in a skillet over medium heat. Sauté the zucchini noodles for 2-3 minutes until just tender, then season lightly with a pinch of salt.
Plate the zucchini noodles and top with the crispy chicken parmesan. Serve immediately while the cheese is hot and stretchy.