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 bowl, mix the almond flour, parmesan cheese, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg wash, then dredge it through the almond flour mixture, pressing firmly to ensure an even, thick coating.
Place the breaded chicken on the baking sheet and drizzle with the olive oil.
Bake for 15 to 18 minutes, or until the chicken is cooked through and the crust is golden brown.
Remove from the oven, spoon the marinara sauce over the chicken, and top with the mozzarella cheese.
Return to the oven under the broiler for 2 to 3 minutes until the cheese is melted and bubbly.
While the cheese melts, lightly sauté the zucchini noodles in a non-stick pan for 2 minutes until just tender.
Plate the zucchini noodles and place the crispy chicken parmesan on top to serve.