Preheat your oven to 400°F and line a baking sheet with parchment paper.
Pound the chicken breast to an even half-inch thickness to ensure uniform cooking.
In a shallow bowl, whisk the egg; in a separate bowl, combine the almond flour, parmesan, garlic powder, oregano, salt, and pepper.
Dredge the chicken in the egg wash, then press firmly into the almond flour mixture until fully and evenly coated.
Place the chicken on the prepared baking sheet and bake for 15 minutes.
Spoon the marinara sauce over the chicken and top with shredded mozzarella, then bake for an additional 5 minutes until the cheese is bubbly.
While the chicken finishes, sauté the zucchini noodles in olive oil over medium heat for 2-3 minutes until just tender.
Serve the crispy chicken immediately over the bed of warm zucchini noodles.