Butterfly the chicken breast to even thickness and season both sides with sea salt, black pepper, and garlic powder.
In a shallow bowl, whisk the egg white until it becomes slightly frothy.
In a separate shallow dish, combine the almond flour, grated parmesan cheese, and dried oregano to create the breading.
Dip the seasoned chicken into the egg white, allowing excess to drip off, then press firmly into the parmesan mixture until fully coated.
Heat the avocado oil in a large non-stick skillet over medium heat.
Place the chicken in the skillet and sear for 5 to 6 minutes per side until the crust is golden brown and the internal temperature reaches 165 degrees.
While the chicken is resting, 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 but not watery.
Plate the zucchini noodles, ladle the warm marinara over them, and top with the crispy parmesan chicken.