Preheat your oven to 400°F and line a baking sheet with parchment paper.
Place the chicken breast between two pieces of plastic wrap and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg until smooth.
In a second shallow bowl, combine the almond flour, grated parmesan, dried oregano, garlic powder, sea salt, and black pepper.
Dip the chicken into the egg wash, then press firmly into the almond flour mixture until fully coated on both sides.
Place the chicken on the prepared baking sheet and bake for 15 minutes.
Remove from the oven, spoon the marinara sauce over the chicken, and sprinkle with the shredded mozzarella.
Return to the oven and bake for another 5 minutes, or until the cheese is bubbly and golden brown.
Garnish with fresh basil before serving.