Drizzle the chicken with the oil and sprinkle it with garlic powder, Italian seasoning, sea salt, and pepper. Rub it on both sides really well.
Heat a large oven-safe skillet over medium-high heat. Sear the chicken until nicely golden-brown on both sides. About 4 minutes on each side.
Spoon your marinara sauce into the skillet over the chicken. Coat chicken to your liking with the marinara. I personally like a lot of sauce so I add extra.
Sprinkle the chicken with mozzarella cheese and parmesan cheese.
Transfer the skillet to the preheated oven and bake for about 5-7 minutes, or until the chicken is cooked through and the cheese is melted.
Garnish with freshly chopped parsley, if desired, and serve while hot and melty.