Place the chicken breast between two sheets of parchment paper and pound to an even 1/2-inch thickness to ensure uniform cooking.
Whisk the egg in a shallow bowl until smooth. In a separate shallow bowl, combine the almond flour, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dredge the chicken breast into the egg wash, then press it firmly into the parmesan mixture until it is fully coated on all sides.
Heat the olive oil in a large non-stick skillet over medium heat. Add the chicken and cook for 5-6 minutes per side until the crust is golden and the chicken is cooked through.
While the chicken is searing, 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, sauté the zucchini noodles for 1-2 minutes until they are just tender but still have a slight bite.
Divide the zucchini noodles onto a plate, ladle the warm marinara over them, and top with the crispy parmesan chicken breast.