Preheat your oven to 400°F and line a small baking sheet with parchment paper.
In a shallow bowl, whisk the half egg; in a second shallow bowl, combine the almond flour, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, then dredge it through the almond flour mixture until it is thoroughly and evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat and sear the chicken for 2-3 minutes per side until the crust is golden brown.
Place the seared chicken on the prepared baking sheet, spread the marinara sauce over the top, and sprinkle with the mozzarella cheese.
Bake for 12-15 minutes or until the chicken reaches an internal temperature of 165°F and the cheese is bubbly.
While the chicken bakes, spiralize the zucchini into noodles and lightly sauté them in the same skillet used for the chicken for 2-3 minutes until just tender.
Plate the zucchini noodles and top with the crispy chicken parmesan.