Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel and season both sides with sea salt, black pepper, and garlic powder.
In one shallow bowl, whisk the large egg until smooth; in a second bowl, combine the almond flour, parmesan cheese, and dried oregano.
Dip the chicken breast into the egg wash, letting any excess drip off, then press it firmly into the almond flour mixture until it is fully and evenly coated.
Place the coated chicken on the prepared baking sheet, drizzle with olive oil, and bake for 15-18 minutes until the crust is golden and the chicken is cooked through.
Remove the chicken from the oven, spoon the marinara sauce over the top, and sprinkle with the mozzarella cheese.
Return the chicken to the oven and broil for 2 minutes until the mozzarella is melted and bubbling.
While the chicken finishes, spiralize the zucchini and sauté it in a non-stick pan over medium heat for 2-3 minutes until just tender, then serve the chicken over the zoodles.