Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Pound the chicken breast between two pieces of plastic wrap to an even half-inch thickness to ensure uniform cooking.
Whisk the egg in a shallow bowl. In a separate bowl, stir together the almond flour, parmesan cheese, sea salt, black pepper, garlic powder, and oregano.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then press firmly into the almond flour mixture until thoroughly coated.
Place the breaded chicken on the prepared baking sheet and bake for 15 to 18 minutes until the crust is golden and the chicken is cooked through.
Remove the pan from the oven, spoon the marinara sauce over the chicken, and sprinkle with the shredded mozzarella.
Return the chicken to the oven and broil for 2 to 3 minutes until the cheese is bubbly and slightly browned.
While the cheese melts, quickly sauté the zucchini noodles in a pan with olive oil for 2 minutes until just tender.
Serve the crispy chicken parmesan immediately over the warm zucchini noodles.