01 - Preheat the oven to 400°F. Line a baking dish with parchment paper or lightly grease it.
02 - In a skillet over medium heat, sauté the spinach for 2 to 3 minutes until wilted. Remove from heat and allow to cool slightly.
03 - Squeeze out excess moisture from the spinach. Combine spinach, feta, cream cheese, garlic, dill, parsley, lemon zest, salt, and pepper in a mixing bowl. Mix thoroughly.
04 - Pat the chicken breasts dry. Using a sharp knife, cut a horizontal pocket into the thickest part of each breast, taking care not to cut through completely.
05 - Fill each chicken breast pocket with an equal portion of the spinach and feta mixture. Secure openings with toothpicks if necessary.
06 - Brush chicken breasts with olive oil. Season both sides with paprika, salt, and black pepper.
07 - Place stuffed breasts in the prepared baking dish. Bake for 25 to 30 minutes until the internal temperature reaches 165°F and juices run clear.
08 - Allow chicken to rest for 5 minutes before removing toothpicks and serving.