Butterfly the chicken breast to ensure even thickness and season both sides with sea salt, black pepper, and garlic powder.
In a shallow bowl, whisk the egg until smooth.
In a separate shallow bowl, combine the grated parmesan cheese and almond flour, mixing well.
Dip the seasoned chicken breast into the egg wash, then press firmly into the parmesan mixture until thoroughly coated on all sides.
Heat the olive oil in a non-stick skillet over medium heat.
Place the chicken in the skillet and sear for 4 to 5 minutes per side until the crust is golden brown and the chicken is cooked through.
Spoon the marinara sauce over the chicken and top with the mozzarella cheese.
Cover the skillet with a lid for 1 to 2 minutes until the cheese is completely melted and bubbly.
Garnish with chopped fresh parsley before serving.