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 egg until smooth; in a separate bowl, combine the almond flour, parmesan cheese, garlic powder, oregano, salt, and pepper.
Dredge the chicken breast into the egg wash, then press firmly into the parmesan mixture until the exterior is completely and evenly coated.
Heat the olive oil in a non-stick skillet over medium heat, then sear the chicken for 5-6 minutes per side until the crust is golden and crisp.
While the chicken cooks, warm the marinara sauce in a small saucepan and quickly sauté the zucchini noodles in a separate pan for 2 minutes until just tender.
Plate the zucchini noodles, place the crispy chicken on top, and finish with a generous pour of the warm marinara sauce.