Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
In a shallow bowl, whisk the liquid egg whites. In a separate shallow bowl, combine the almond flour, grated parmesan, Italian seasoning, garlic powder, sea salt, and black pepper.
Dip the chicken into the egg whites, letting the excess drip off, then press firmly into the parmesan mixture until fully coated on both sides.
Heat the avocado oil in a non-stick skillet over medium heat. Once hot, add the chicken and cook for 4-5 minutes per side until the crust is golden brown and the chicken is cooked through.
While the chicken finishes, warm the marinara sauce in a small saucepan or microwave.
Spoon the marinara sauce over the chicken in the skillet and top with the fresh mozzarella cheese. Cover the pan for 1-2 minutes until the cheese is melted and bubbly.
In a separate small pan, lightly sauté the zucchini noodles for 2 minutes until just tender, then serve the chicken over the noodles.