Preheat oven to 400°F and line a 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 another bowl, combine almond flour, garlic powder, oregano, salt, and pepper.
Dip the chicken into the egg wash, then coat thoroughly with the almond flour mixture.
Place chicken on the baking sheet and bake for 15 minutes.
Remove from oven, spoon marinara over the chicken, and top with mozzarella and parmesan.
Return to the oven for 5-7 minutes until the cheese is bubbly and golden.
While chicken finishes, spiralize the zucchini and sauté in olive oil for 2-3 minutes until just tender.
Serve the baked chicken over the zucchini noodles.