Preheat your oven to 400°F and lightly grease a rimmed baking sheet with the olive oil.
In a shallow bowl, whisk the egg until smooth. In a separate shallow dish, combine the almond flour, parmesan cheese, oregano, garlic powder, salt, and pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then dredge it in the almond flour mixture, pressing firmly to ensure an even coating.
Place the coated chicken on the prepared baking sheet and bake for 18-22 minutes, or until the crust is golden and the internal temperature reaches 165°F.
While the chicken is baking, warm the marinara sauce in a small saucepan over medium-low heat until simmering.
In a separate skillet, sauté the zucchini noodles for 2-3 minutes until just tender, then drain any excess liquid to prevent sogginess.
To serve, plate the zucchini noodles, top with the zesty marinara sauce, and place the crispy chicken breast on top.