Preheat your oven to 400°F and lightly grease a small baking dish with the olive oil.
Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
Season both sides of the chicken with sea salt and black pepper.
In a shallow bowl, whisk the egg until smooth; in a second shallow bowl, combine the almond flour, grated parmesan, garlic powder, and dried oregano.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then dredge it in the almond flour mixture, pressing firmly to ensure an even coating.
Place the breaded chicken into the prepared baking dish and bake for 15 minutes.
Remove the dish from the oven, pour the marinara sauce over the chicken, and sprinkle with the shredded mozzarella.
Return to the oven and bake for an additional 5 to 8 minutes, or until the cheese is melted and bubbly and the chicken reaches an internal temperature of 165°F.
Garnish with freshly chopped basil before serving.