Preheat your oven to 450 degrees f.
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.
Enjoy!