Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Place the chicken breast between two sheets of parchment and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg; in a second bowl, combine the almond flour, parmesan, garlic powder, oregano, salt, and pepper.
Dip the chicken into the egg wash, then dredge it through the almond flour mixture, pressing firmly to ensure an even coating.
Heat the olive oil in a non-stick skillet over medium heat and sear the chicken for 3 minutes per side until the crust is golden brown.
Transfer the chicken to the baking sheet, spoon the marinara sauce over the top, and sprinkle with the mozzarella cheese.
Bake for 10-12 minutes until the chicken is cooked through and the cheese is bubbly.
While the chicken bakes, lightly sauté the zucchini noodles in the same skillet for 2 minutes until just tender, then serve the chicken on top.