Preheat oven to 400°F and line a baking sheet with parchment paper, lightly brushing it with half of the olive oil.
Pound the chicken breast to an even thickness and season both sides with sea salt and black pepper.
In a shallow bowl, whisk the egg; in another bowl, combine almond flour, parmesan, garlic powder, and oregano.
Dip the chicken into the egg wash, then press firmly into the almond flour mixture until fully coated.
Place chicken on the baking sheet and bake for 15 minutes until the coating starts to turn golden.
Remove from oven, spoon marinara sauce over the chicken, and top with shredded mozzarella cheese.
Return to the oven for 5-7 minutes until the cheese is melted and bubbly and the chicken is cooked through.
While chicken finishes, lightly sauté zucchini noodles in a pan with the remaining olive oil until just tender, then serve the chicken on top.