Butterfly the chicken breast or pound it to an even half-inch thickness for uniform cooking.
In a shallow bowl, whisk the egg until smooth.
In a separate shallow dish, combine the almond flour, parmesan cheese, garlic powder, dried oregano, 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 thoroughly coated on both sides.
Heat the olive oil in a non-stick skillet over medium heat.
Place the chicken in the skillet and cook for 5-6 minutes per side, or until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken cooks, warm the marinara sauce in a small saucepan over low heat.
Remove the chicken from the skillet and let it rest. In the same skillet, add the zucchini noodles and sauté for 2 minutes until just tender but not mushy.
Plate the zucchini noodles, place the crispy chicken on top, and finish with a generous pour of warm marinara sauce.