Pat the chicken breast dry with a paper towel and slice it into thin, even cutlets.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the almond flour, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dip each chicken cutlet into the egg wash, allowing excess to drip off, then dredge thoroughly in the parmesan mixture, pressing gently to adhere.
Heat the olive oil in a non-stick skillet over medium heat. Add the chicken and cook for 4-5 minutes per side until the crust is golden brown and the chicken is cooked through.
While the chicken cooks, warm the marinara sauce in a small saucepan over low heat.
Remove the chicken from the skillet and set aside. In the same skillet, add the zucchini noodles and sauté for 1-2 minutes until just tender but still bright green.
Place the zucchini noodles on a plate, top with the crispy chicken and warm marinara sauce, then garnish with fresh basil leaves.