Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Place the chicken breast between two sheets of parchment paper and pound with a meat mallet until it reaches an even half-inch thickness.
In a shallow bowl, whisk the egg until smooth; in a separate shallow dish, combine the almond flour, parmesan cheese, garlic powder, oregano, salt, and pepper.
Dip the chicken breast into the egg wash, shaking off any excess, then press firmly into the almond flour mixture to create a thick, even coating.
Heat the olive oil in a medium oven-safe skillet over medium-high heat and sear the chicken for 2-3 minutes per side until the crust is golden brown.
Spread the marinara sauce evenly over the top of the seared chicken and sprinkle with the shredded mozzarella cheese.
Place the skillet into the oven and bake for 10-12 minutes, or until the chicken reaches an internal temperature of 165°F and the cheese is bubbly.
Remove from the oven and let rest for 2 minutes before garnishing with freshly chopped basil and serving.