Steps
1. Preheat oven to 375°F (190°C).
2. Using a sharp knife, carefully cut a pocket into the side of the chicken breast.
3. In a small bowl, mix mozzarella, cream cheese, spinach, and garlic.
4. Stuff the cheese and spinach mixture into the chicken pocket.
5. Season the outside of the chicken with salt and pepper.
6. Heat olive oil in an oven-safe skillet over medium heat.
7. Sear the chicken breast for 3-4 minutes on each side until golden brown.
8. Transfer the skillet to the oven and bake for 15-20 minutes, until chicken is cooked through.
9. Remove from oven, let rest for 5 minutes, then serve.