Preheat your oven to 400°F and prepare a baking sheet or use an oven-safe skillet.
Butterfly the chicken breast by slicing it horizontally almost all the way through, then opening it like a book to create a thinner, even piece.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the almond flour, grated parmesan, dried oregano, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then press it firmly into the almond flour mixture until both sides are thoroughly coated.
Heat the olive oil in an oven-safe skillet over medium-high heat. Sear the chicken for 3 minutes per side until the crust is golden and crisp.
Spread the marinara sauce evenly over the top of the seared chicken and sprinkle with the shredded mozzarella cheese.
Place the skillet in the oven and bake for 10-12 minutes, or until the chicken reaches an internal temperature of 165°F and the cheese is bubbly.
While the chicken is finishing, lightly sauté the zucchini noodles in a separate pan over medium heat for 2-3 minutes until just tender, then drain any excess moisture.
Plate the zucchini noodles and top with the crispy chicken parmesan to serve.