Prep chicken: Preheat oven to 400°F (200°C). Slice each chicken breast horizontally to create a pocket, without cutting all the way through.
Make filling: In a bowl, mix spinach, cranberries, and feta.
Stuff chicken: Fill each chicken pocket with the mixture, then secure with toothpicks or tie with kitchen twine.
Season: Rub chicken with olive oil, garlic, oregano, salt, and pepper.
Cook: In an oven-safe skillet, sear chicken over medium-high heat for 2–3 minutes per side until golden. Transfer skillet to oven and bake 18–22 minutes, until chicken is cooked through (internal temp 165°F / 74°C).
Serve: Let rest for 5 minutes, remove toothpicks, and serve warm with a fresh salad or roasted veggies.
Nutritional Info (per serving, serves 4):
Calories: 380
Fat: 17g
Carbohydrates: 9g
Fiber: 2g
Sugar: 5g
Protein: 45g
