Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Pound the chicken breast between two pieces of plastic wrap to an even half-inch thickness to ensure uniform cooking.
In a shallow dish, whisk the egg until smooth for dredging.
In another shallow dish, combine the almond flour, parmesan cheese, oregano, garlic powder, salt, and pepper.
Dip the chicken into the egg, then coat thoroughly with the almond flour mixture, pressing it firmly onto the meat to adhere.
Place the chicken on the prepared baking sheet, drizzle with olive oil, and bake for 15-18 minutes until the internal temperature reaches 165°F.
Spoon the marinara sauce over the chicken and top with the shredded mozzarella cheese.
Broil for 2-3 minutes until the cheese is bubbly and slightly browned.
Briefly sauté the zucchini noodles in a pan over medium heat for 2 minutes until just tender and serve the chicken on top.