Preheat your oven to 400°F (200°C).
Place the chicken breast between two sheets of parchment paper and pound with a meat mallet to an even half-inch thickness.
In a shallow bowl, whisk the half egg until smooth. In a second shallow bowl, combine the almond flour, grated parmesan, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then press firmly into the almond flour mixture until both sides are fully coated.
Heat the olive oil in a medium oven-safe skillet over medium-high heat.
Carefully place the chicken in the skillet and sear for 3-4 minutes per side until the crust is crisp and golden brown.
Pour the marinara sauce over the center of the chicken and sprinkle the shredded mozzarella cheese evenly on top.
Transfer the skillet to the preheated oven and bake for 10-12 minutes, or until the cheese is bubbly and the chicken reaches an internal temperature of 165°F.
Remove from the oven and garnish with fresh chopped basil before serving.