Butterfly the chicken breast by slicing it horizontally to ensure even thickness for quick, uniform cooking.
Whisk the egg white in a shallow bowl until slightly frothy; in a separate shallow dish, whisk together the almond flour, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg white, letting any excess drip off, then press it firmly into the parmesan mixture until both sides are thoroughly coated.
Heat the olive oil in a large non-stick skillet over medium heat and sear the chicken 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 until simmering.
Using the same skillet used for the chicken, flash-sauté the zucchini noodles for 1-2 minutes until just tender but still holding their shape.
Place the zucchini noodles on a plate, top with the crispy chicken breast, and finish with a generous pour of the zesty marinara sauce.