Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper for easy cleanup.
In a shallow bowl, whisk the egg white until it becomes slightly frothy.
In a second shallow bowl, combine the almond flour, grated parmesan cheese, dried oregano, garlic powder, sea salt, and black pepper.
Dip the chicken breast into the egg white, ensuring it is fully coated, then dredge it through the almond flour mixture, pressing firmly so the coating adheres.
Place the breaded chicken on the prepared baking sheet and bake for 15 to 18 minutes until the crust is golden and the chicken is cooked through.
Remove the chicken from the oven, spoon the marinara sauce over the top, and sprinkle with the shredded mozzarella cheese.
Return the pan to the oven and broil for 2 to 3 minutes until the cheese is bubbly and slightly browned.
Garnish with fresh basil leaves and serve immediately while hot.