Place the chicken breast between two sheets of parchment paper and pound 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, parmesan cheese, garlic powder, oregano, salt, and pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then dredge it through the parmesan mixture, pressing firmly to ensure a thick crust.
Heat the olive oil in a non-stick skillet over medium heat. Once hot, add the chicken and cook for 5-6 minutes per side until the crust is golden brown and the internal temperature reaches 165 degrees Fahrenheit.
While the chicken cooks, warm the marinara sauce in a small saucepan over low heat.
Remove the chicken from the skillet and let it rest. In the same skillet, add the zucchini noodles and sauté for 2 minutes until just tender but not soggy.
Place the zucchini noodles on a plate, top with the crispy chicken breast, and finish by spooning the warm marinara sauce over the center.