01 - Preheat the oven to 400°F and prepare a baking dish by lining it with parchment paper or greasing it lightly.
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, then squeeze out excess moisture.
03 - Combine the cooked spinach, feta, cream cheese, minced garlic, dill, parsley, lemon zest, salt, and black pepper in a mixing bowl. Stir until well incorporated.
04 - Pat chicken breasts dry. Using a sharp knife, create a pocket horizontally along the thickest part of each breast without cutting through completely.
05 - Divide the filling evenly and stuff each chicken breast pocket. Secure the openings with toothpicks if necessary.
06 - Brush the stuffed breasts with olive oil and season both sides with paprika, salt, and black pepper.
07 - Place the stuffed breasts in the prepared baking dish and bake for 25 to 30 minutes until the internal temperature reaches 165°F and juices run clear.
08 - Allow the chicken to rest for 5 minutes, remove toothpicks, and serve.