Place the chicken breast between two sheets of parchment paper and pound with a meat mallet until it is an even 0.5-inch thickness.
In a shallow bowl, whisk the half egg. In a separate shallow dish, combine the almond flour, grated parmesan, oregano, garlic powder, 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 fully coated on both sides.
Heat the olive oil in a non-stick skillet over medium heat. Add the chicken and cook for 5-6 minutes per side until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken cooks, use a spiralizer to turn the zucchini into noodles. Lightly sauté the zucchini noodles in a separate pan for 2-3 minutes until just tender.
Warm the marinara sauce in a small saucepan or microwave until heated through.
Plate the zucchini noodles, top with the warm marinara sauce, and place the crispy parmesan chicken on top to serve.