Slice the chicken breast into thin cutlets and pound to an even thickness using a meat mallet.
Whisk the egg in a shallow bowl; in a separate shallow bowl, combine the almond flour, parmesan cheese, oregano, garlic powder, salt, and pepper.
Dip each chicken cutlet into the egg wash, then dredge thoroughly in the parmesan mixture until evenly coated on both sides.
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 brown and the chicken is cooked through.
While the chicken cooks, spiralize the zucchini into noodles and lightly sauté them in a separate pan for 2-3 minutes until just tender.
Warm the marinara sauce in a small saucepan over low heat until simmering.
Plate the zucchini noodles, ladle the marinara sauce over the top, and place the crispy parmesan chicken on top to serve.