Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
In a shallow bowl, whisk the egg until smooth. In a separate shallow dish, combine the almond flour, parmesan cheese, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the whisked egg, letting any excess drip off, then press it firmly into the almond flour mixture to coat both sides thoroughly.
Place the breaded chicken on the prepared baking sheet and bake for 15-18 minutes until the chicken is cooked through and the coating is golden.
Remove the chicken from the oven, spoon the marinara sauce over the top, and sprinkle with the shredded mozzarella cheese.
Switch the oven to broil and place the chicken back inside for 2-3 minutes until the cheese is bubbly and slightly browned.
While the chicken rests, heat the olive oil in a skillet over medium heat and sauté the zucchini noodles for 2 minutes until just tender, then serve the chicken over the noodles.