Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
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; in a second bowl, combine almond flour, parmesan, garlic powder, oregano, salt, and pepper.
Dip the chicken into the egg wash, then press firmly into the almond flour mixture until thoroughly coated on both sides.
Place the chicken on the prepared baking sheet and bake for 15 minutes until the coating is firm and lightly browned.
Spoon the marinara sauce over the chicken and top with shredded mozzarella cheese.
Return to the oven and broil for 2 to 3 minutes until the cheese is bubbly and golden.
Garnish with freshly chopped basil before serving.