Preheat your oven to 425°F and line a baking sheet with parchment paper.
Place the chicken breast between two sheets of plastic wrap and pound to an even 1/2-inch thickness.
In a shallow bowl, whisk the egg until smooth. In a second shallow bowl, combine the panko, almond flour, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, letting any excess drip off, then press firmly into the breadcrumb mixture until evenly coated on both sides.
Place the breaded chicken on the prepared baking sheet and drizzle or spray with olive oil.
Bake for 12 to 15 minutes until the coating is golden and the chicken is nearly cooked through.
Remove from the oven and spoon the marinara sauce over the center of the chicken, then top with the shredded mozzarella.
Return to the oven for an additional 3 to 5 minutes until the cheese is melted and bubbly.
Sprinkle with parmesan cheese and serve immediately.