Steps
1. Preheat oven to 375°F (190°C).
2. Cut a pocket into the side of the chicken breast.
3. In a bowl, mix together the shredded mozzarella, chopped spinach, salt, and pepper.
4. Stuff the cheese and spinach mixture into the pocket of the chicken.
5. Heat olive oil in an oven-safe skillet over medium-high heat.
6. Sear the chicken on both sides until golden brown.
7. Transfer the skillet to the oven and bake for about 15-20 minutes or until the chicken is fully cooked.
8. Serve hot and enjoy!