Preheat your oven to 400°F and place a wire rack over a rimmed baking sheet to ensure the chicken stays crispy on all sides.
Place the chicken breast between two pieces of parchment paper and pound to an even half-inch thickness for uniform cooking.
In a shallow bowl, whisk the half egg until smooth; in a second shallow bowl, combine the almond flour, parmesan, garlic powder, oregano, salt, and pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then press firmly into the almond flour mixture until thoroughly coated.
Place the breaded chicken onto the wire rack and lightly drizzle or spray with the olive oil to help the crust brown.
Bake for 15 to 18 minutes, or until the internal temperature reaches 165°F and the coating is golden and firm.
Remove the tray from the oven, spoon the marinara sauce over the center of the chicken, and sprinkle with the shredded mozzarella.
Return the chicken to the oven for 2 to 3 minutes, or until the cheese is bubbly and beginning to brown.
While the cheese melts, lightly sauté the zucchini noodles in a non-stick pan over medium heat for 2 minutes until just tender.
Plate the zucchini noodles first, top with the crispy chicken parmesan, and garnish with freshly chopped basil before serving.