Place the chicken breast between two sheets of parchment paper and pound to a uniform half-inch thickness.
In a shallow bowl, whisk the egg until smooth. In a second bowl, combine the almond flour, Parmesan cheese, garlic powder, oregano, salt, and pepper.
Dredge the chicken in the egg wash, allowing the excess to drip off, then press firmly into the Parmesan mixture until evenly coated on both sides.
Heat the olive oil in a large 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 meat 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. Add the zucchini noodles to the same skillet and sauté for 2 minutes until just tender.
Divide the zucchini noodles between plates, top with the crispy chicken, and finish with a generous pour of the warm marinara sauce.