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 plastic wrap and pound to an even 1/2-inch thickness to ensure even cooking.
In a shallow bowl, whisk the half egg until smooth to create a binder for the breading.
In a separate shallow bowl, combine the almond flour, parmesan cheese, garlic powder, dried oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, allowing any excess to drip off, then dredge thoroughly in the almond flour mixture until fully coated.
Place the coated chicken on the prepared baking sheet and bake for 15-18 minutes until the crust is golden and the chicken is cooked through.
Remove the pan from the oven and spoon the marinara sauce over the center of the chicken, then top with the shredded mozzarella cheese.
Return the pan to the oven and broil for 2-3 minutes until the cheese is bubbly and slightly browned.
Garnish with freshly chopped basil and serve immediately while the cheese is perfectly melted.