Preheat your oven to 400°F (200°C).
In a shallow bowl, whisk the egg until smooth. In a second bowl, combine the almond flour, parmesan cheese, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, then press firmly into the almond-parmesan mixture until evenly coated on all sides.
Heat the olive oil in an oven-safe skillet over medium-high heat. Sear the chicken for 2-3 minutes per side until the crust is golden brown.
Transfer the skillet to the oven and bake for 10-12 minutes, or until the internal temperature of the chicken reaches 165°F (74°C).
While the chicken bakes, spiralize the zucchini into noodles and lightly sauté them in a non-stick pan for 2-3 minutes until just tender.
Warm the marinara sauce in a small saucepan over low heat.
Plate the zucchini noodles, top with the crispy chicken breast, and finish with a generous pour of the warm marinara sauce.