Preheat your oven to 400°F and line a baking sheet with parchment paper.
Place the chicken breast between two pieces of plastic wrap and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg; in a second bowl, combine almond flour, parmesan, oregano, garlic powder, salt, and pepper.
Dip the chicken into the egg wash, then coat thoroughly in the almond flour mixture, pressing to adhere.
Place the chicken on the prepared baking sheet and bake for 15 minutes until the coating is crisp.
Remove from the oven, spoon the marinara sauce over the chicken, and top with the mozzarella cheese.
Return to the oven and broil for 2-3 minutes until the cheese is melted and bubbly.
Garnish with fresh basil before serving.