01 - Preheat the oven to 400°F. Lightly grease a baking dish with 1 tbsp olive oil.
02 - Heat 1 tbsp olive oil in a skillet over medium heat. Sauté the chopped spinach until wilted, about 2–3 minutes. Remove from heat and let cool slightly.
03 - In a mixing bowl, combine the cooked spinach, feta cheese, cream cheese, garlic, parsley, dill, 1/4 tsp salt, and 1/4 tsp black pepper. Mix until well combined.
04 - Pat the chicken breasts dry with paper towels. Using a sharp knife, cut a deep horizontal pocket into the thickest side of each breast, being careful not to cut all the way through.
05 - Divide the spinach-feta mixture evenly among the 4 chicken breasts. Stuff each pocket and secure with toothpicks if needed to keep the filling inside.
06 - Place the stuffed breasts in the prepared baking dish. Brush with remaining olive oil. Sprinkle paprika, oregano, salt, and pepper evenly over the tops.
07 - Bake for 25–30 minutes, or until the chicken is cooked through and the internal temperature reaches 165°F. The juices should run clear when pierced.
08 - Remove toothpicks before serving. Let the chicken rest for 5 minutes to retain juices, then slice and serve.