Place the chicken breast between two sheets of parchment paper and pound to an even thickness of about half an inch.
In a shallow bowl, whisk the egg until the yolk and white are fully combined.
In a second shallow bowl, stir together the almond flour, grated parmesan, oregano, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing excess to drip off, then press firmly into the parmesan mixture until both sides are thoroughly coated.
Heat the olive oil in a large non-stick skillet over medium heat and sear the chicken for 5 to 6 minutes per side until the crust is golden brown and the internal temperature reaches 165 degrees Fahrenheit.
While the chicken cooks, use a spiralizer to turn the zucchini into thin noodles.
In a small saucepan over medium-low heat, warm the marinara sauce until it begins to simmer gently.
Remove the chicken from the skillet and let it rest for 3 minutes; meanwhile, add the zucchini noodles to the same skillet and sauté for 2 minutes until just tender.
Plate the zucchini noodles, ladle the warm marinara sauce over them, and top with the crispy parmesan chicken.