Slice the chicken breast into thin cutlets or pound to an even half-inch thickness for uniform cooking.
Whisk the egg in a shallow bowl; in a separate shallow bowl, combine the almond flour, parmesan cheese, oregano, garlic powder, sea salt, and black pepper.
Dip each chicken cutlet into the egg wash, allowing excess to drip off, then press firmly into the parmesan mixture to coat both sides thoroughly.
Heat the olive oil in a large non-stick skillet over medium heat and sear the chicken for 4 to 5 minutes per side until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken is searing, use a spiralizer to create zucchini noodles and lightly sauté them in a separate pan for 2 to 3 minutes until just tender.
Warm the marinara sauce in a small saucepan over low heat until it begins to simmer.
Place the zucchini noodles on a plate, top with the crispy chicken cutlets, ladle the warm marinara sauce over the top, and garnish with freshly chopped basil.