Preheat your oven to 400°F and prepare a baking sheet or oven-safe skillet.
Place the chicken breast between two pieces of parchment paper and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg whites until slightly frothy.
In a separate shallow dish, combine the almond flour, parmesan cheese, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken into the egg whites, then press firmly into the almond flour mixture to coat both sides.
Heat the avocado oil in an oven-safe skillet over medium-high heat and sear the chicken for 3 minutes per side until the crust is golden.
Spread the marinara sauce over the chicken and top with the sliced mozzarella cheese.
Transfer the skillet to the oven and bake for 10 minutes, or until the chicken reaches an internal temperature of 165°F and the cheese is bubbly.
Garnish with fresh basil before serving.