Directions
Preheat your oven to 350°F / 175°C.
Pat the chicken breasts dry and season generously on both sides with sea salt and ground black pepper.
Heat the olive oil in a large, oven-safe skillet (cast-iron is perfect) over medium-high heat.
Once the oil is shimmering, carefully place the chicken in the skillet and sear for 4-5 minutes, until a deep golden-brown crust forms on the first side.
Flip the chicken over. Spoon the marinara sauce over each breast, then top with the shredded mozzarella and a sprinkle of Italian seasoning. Immediately transfer the skillet to the preheated oven.
Bake for 20-25 minutes, or until the chicken is cooked through (reaching an internal temperature of 165°F / 74°C) and the cheese is bubbly and melted.
Carefully remove the skillet from the oven.
Sprinkle the Parmesan cheese over the top and return to the oven for 3-5 more minutes, just until the Parmesan is melted.
Garnish with fresh, torn basil leaves before serving hot.