Slice the chicken breast into thin cutlets and season both sides with sea salt and black pepper.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the grated parmesan, almond flour, dried oregano, and garlic powder.
Dip each chicken cutlet into the egg wash, allowing any excess to drip off, then press firmly into the parmesan mixture until evenly coated.
Heat the olive oil in a large skillet over medium heat and cook the chicken for 4-5 minutes per side until the crust is golden and the chicken is cooked through.
While the chicken is cooking, use a spiralizer to turn the zucchini into long noodles.
In a small saucepan, warm the marinara sauce over low heat until it begins to simmer.
Remove the chicken from the skillet and set aside; flash-sauté the zucchini noodles in the same skillet for 1-2 minutes until just tender.
Plate the zucchini noodles, top with the crispy chicken cutlets, and ladle the warm marinara sauce over the top before serving.