Preheat your oven to 400°F (200°C).
Place the chicken breast between two sheets of parchment paper and pound it to an even half-inch thickness for uniform cooking.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the almond flour, half of the parmesan cheese, sea salt, black pepper, garlic powder, and dried oregano.
Dip the chicken breast into the egg wash, allowing excess to drip off, then press firmly into the almond flour mixture until both sides are thoroughly coated.
Heat the olive oil in a medium oven-safe skillet over medium-high heat and sear the chicken for 3 minutes per side until the crust is golden and crisp.
Spoon the marinara sauce over the center of the chicken breast and top with the mozzarella cheese and the remaining parmesan.
Transfer the skillet to the oven and bake for 10-12 minutes until the cheese is bubbly and the internal temperature of the chicken reaches 165°F.
While the chicken is baking, use a spiralizer to create zucchini noodles and sauté them in a separate pan for 2 minutes until just tender.
Plate the zucchini noodles and place the crispy chicken parmesan directly on top to serve.