Place the chicken breast between two sheets of parchment paper and pound with a meat mallet to an even 1/2-inch thickness.
In a shallow bowl, whisk the egg until smooth. In a separate shallow bowl, combine the almond flour, parmesan cheese, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then press firmly into the parmesan mixture until both sides are thoroughly coated.
Heat the olive oil in a large non-stick skillet over medium heat. Once the pan is 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.
Remove the chicken from the skillet and let it rest on a clean plate. In the same skillet, add the zucchini noodles and sauté for 2-3 minutes until just tender but not mushy.
While the zucchini cooks, warm the marinara sauce in a small saucepan over low heat until simmering.
Plate the zucchini noodles first, place the crispy chicken on top, and finish with a generous ladle of the zesty marinara sauce.