Steps
1. Preheat your oven to 375°F (190°C).
2. In a bowl, mix the cream cheese, mozzarella cheese, spinach, garlic, salt, pepper, and oregano until well combined.
3. Cut a pocket in the chicken breast and stuff it with the cheese mixture.
4. Heat olive oil in an oven-safe skillet over medium heat. Sear the stuffed chicken breast for 3-4 minutes on each side until golden brown.
5. Transfer the skillet to the preheated oven and bake for 20-25 minutes, or until the chicken is cooked through.
6. Let it rest for 5 minutes before slicing and serving.