Steps
1. Preheat the oven to 375°F (190°C).
2. In a small bowl, mix together spinach, feta, garlic, oregano, salt, and pepper.
3. Cut a pocket into the side of the chicken breast.
4. Stuff the spinach and feta mixture into the pocket.
5. Heat olive oil in an oven-safe skillet over medium-high heat.
6. Sear the chicken breast for 2-3 minutes per side.
7. Transfer the skillet to the preheated oven and bake for 20-25 minutes, or until chicken is cooked through.
8. Serve hot and enjoy!