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