Preheat your oven to 400°F.
Pound the chicken breast between two sheets of parchment paper to an even thickness for uniform cooking.
Whisk the egg white in a shallow bowl until slightly frothy.
In a separate shallow dish, combine the almond flour, grated parmesan, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg white to coat, then press it firmly into the almond flour mixture on both sides.
Heat the avocado 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 over the top of the chicken and sprinkle with the mozzarella cheese.
Place the skillet in the oven and bake for 10 minutes until the cheese is melted and the chicken is cooked through.
While the chicken bakes, flash-sauté the zucchini noodles in a separate pan with lemon juice for 2 minutes until just tender.
Serve the crispy chicken immediately over the bed of zucchini noodles.