Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Place the chicken breast between two sheets of plastic wrap and gently pound it to an even 1/2-inch thickness.
In a shallow bowl, whisk the egg white until slightly frothy. In a second shallow bowl, combine the panko breadcrumbs, sea salt, black pepper, and garlic powder.
Dip the chicken breast into the egg white, coating both sides, then press it into the panko mixture until thoroughly crusted.
Place the chicken on the prepared baking sheet and lightly mist or drizzle with half of the olive oil.
Bake for 12-15 minutes, then remove from the oven and spoon the marinara sauce over the center of the chicken.
Top with the mozzarella and parmesan cheeses, then return to the oven for 3-5 minutes until the cheese is melted and bubbly.
While the chicken finishes, sauté the zucchini noodles in a pan with the remaining olive oil over medium heat for 2-3 minutes until just tender.
Serve the crispy chicken parmesan immediately over the bed of zucchini noodles.