Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness, then season both sides with sea salt, black pepper, and garlic powder.
In a shallow bowl, whisk the half egg. In a second shallow bowl, combine the almond flour, grated parmesan cheese, and dried oregano.
Dip the chicken into the egg wash, letting any excess drip off, then press firmly into the parmesan mixture until fully coated on both sides.
Heat the olive oil in a non-stick skillet over medium heat. Add the chicken and cook 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 or slice into thin rounds. In a separate small pan, warm the marinara sauce over low heat.
Remove the chicken from the skillet and let it rest. In the same skillet, quickly sauté the zucchini for 2 minutes until just tender but still crisp.
Plate the zucchini noodles, top with the warm marinara sauce, and place the crispy parmesan chicken on top.