Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
In a shallow dish, whisk the egg white until slightly frothy.
In a separate shallow dish, combine the almond flour, parmesan cheese, oregano, garlic powder, salt, and pepper.
Dip the chicken into the egg white, letting the excess drip off, then press firmly into the parmesan mixture until fully coated.
Heat the avocado oil in a large skillet over medium-high heat until shimmering.
Carefully place the chicken in the skillet and cook for 4-5 minutes per side until the crust is golden brown and the chicken is cooked through.
Spoon the marinara sauce over the chicken and top with the mozzarella cheese.
Cover the skillet with a lid for 1-2 minutes until the cheese is bubbly and melted.
Garnish with fresh basil and serve immediately.