Preheat your oven to 400°F and line a baking sheet with parchment paper.
Place the chicken breast between two sheets of parchment and pound to an even 1/2-inch thickness.
In a shallow bowl, whisk the egg. In a second bowl, combine almond flour, parmesan, garlic powder, oregano, salt, and pepper.
Dip the chicken into the egg wash, then press firmly into the almond flour mixture until fully coated.
Place chicken on the baking sheet and bake for 15 minutes until the crust is golden and chicken is cooked through.
Spoon the marinara sauce over the chicken, top with mozzarella, and return to the oven for 3 minutes until melted.
While cheese melts, sauté zucchini noodles in a pan with olive oil for 2 minutes until just tender.
Serve the crispy chicken over the warm zucchini noodles and enjoy immediately.