Preheat your oven to 400°F (200°C) and prepare an oven-safe skillet.
Place the chicken breast between two sheets of parchment paper and pound with a mallet until it reaches an even half-inch thickness.
In a shallow bowl, whisk the half egg until smooth; in a second bowl, combine the almond flour, parmesan cheese, dried oregano, garlic powder, sea salt, and black pepper.
Dredge the chicken breast into the egg wash, allowing any excess to drip off, then press firmly into the herb-almond mixture until fully coated on all sides.
Heat the avocado oil in the oven-safe skillet over medium-high heat, then sear the chicken for 2-3 minutes per side until the crust is golden and crispy.
Spread the marinara sauce over the top of the chicken and sprinkle with the shredded mozzarella cheese.
Transfer the skillet to the oven and bake for 8-10 minutes, or until the chicken reaches an internal temperature of 165°F and the cheese is bubbly.
While the chicken bakes, lightly sauté the zucchini noodles in a separate pan for 2 minutes with a pinch of salt until just tender but still al dente.
Plate the zucchini noodles, top with the crispy chicken parmesan, and garnish with fresh chopped parsley.