Butterfly the chicken breast and pound it between two sheets of parchment paper to an even half-inch thickness.
In a shallow bowl, whisk the half egg until smooth.
In a separate shallow dish, combine the parmesan cheese, almond flour, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, letting the excess drip off, then press firmly into the parmesan mixture to coat both sides.
Heat the olive oil in a non-stick skillet over medium heat.
Place the chicken in the skillet and sear for 5-6 minutes per side until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken rests, warm the marinara sauce in a small saucepan over low heat.
In the same skillet used for the chicken, flash-sauté the zucchini noodles for 2 minutes until just tender-crisp.
Plate the zucchini noodles, top with the warm marinara sauce, and place the crispy parmesan chicken on top.