Preheat your oven to 400°F (200°C).
Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg until well combined.
In a second shallow bowl, mix the almond flour, 1 tablespoon of the parmesan cheese, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing excess to drip off, then coat thoroughly in the almond flour mixture, pressing to adhere.
Heat the olive oil in an oven-safe skillet over medium-high heat and sear the chicken for 2-3 minutes per side until a golden crust forms.
Spread the marinara sauce over the top of the chicken and sprinkle with the shredded mozzarella and the remaining tablespoon of parmesan.
Place the skillet in the oven and bake for 5-8 minutes, or until the chicken is cooked through and the cheese is bubbly and slightly browned.
While the chicken finishes, lightly sauté the zucchini noodles in a separate pan for 2 minutes until just tender.
Plate the zucchini noodles and top with the crispy chicken parmesan.