Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
In a shallow bowl, whisk the half egg. In a separate shallow dish, 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 coating adheres to all sides.
Place the breaded chicken on the prepared baking sheet and bake for 15 minutes.
Remove the chicken from the oven and spoon the marinara sauce over the top, then sprinkle with the shredded mozzarella cheese.
Return the chicken to the oven for an additional 5 to 7 minutes, or until the cheese is melted and bubbly and the chicken is cooked through.
While the chicken finishes, sauté the zucchini noodles in a pan with the olive oil over medium heat for 2 to 3 minutes until just tender.
Serve the crispy chicken parmesan over the bed of zucchini noodles and enjoy immediately.