Preheat oven to 400°F and line a baking sheet with parchment paper.
In a shallow bowl, whisk the egg. In another bowl, combine almond flour, parmesan, garlic powder, oregano, salt, and pepper.
Dip the chicken breast into the egg wash, then coat thoroughly with the almond flour mixture, pressing to adhere.
Heat olive oil in an oven-safe skillet over medium-high heat and sear the chicken for 2-3 minutes per side until golden brown.
Spoon marinara sauce over the chicken and sprinkle with mozzarella cheese.
Transfer the skillet to the oven and bake for 10-12 minutes until the chicken is cooked through and cheese is bubbly.
While chicken bakes, lightly sauté zucchini noodles in a separate pan for 2 minutes until just tender.
Serve the crispy chicken over the zucchini noodles.