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, grated parmesan, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, ensuring it is fully coated, then dredge it through the almond flour mixture, pressing firmly so the breading adheres.
Heat the olive oil in a small oven-safe skillet over medium-high heat. Once hot, sear the chicken for 2-3 minutes per side until the crust is golden and fragrant.
Spoon the marinara sauce over the chicken and sprinkle evenly with the shredded mozzarella cheese.
Place the skillet into the oven and bake for 10-12 minutes, or until the chicken reaches an internal temperature of 165°F and the cheese is melted and bubbly.
While the chicken is finishing, lightly sauté the zucchini noodles in a separate non-stick pan for 2 minutes over medium heat until just tender but not watery.
Plate the zucchini noodles and top with the crispy chicken parmesan, garnishing with extra herbs if desired.