01 - Preheat oven to 375°F. Lightly grease a baking dish.
02 - In a skillet over medium heat, add 1 tablespoon olive oil. Sauté garlic for 1 minute, then add spinach. Cook until wilted, about 2-3 minutes. Let cool slightly.
03 - In a bowl, combine cooked spinach, feta, cream cheese (if using), dill, nutmeg, and lemon zest. Mix thoroughly.
04 - Pat chicken breasts dry. Using a sharp knife, carefully cut a pocket into the thickest side of each breast, being careful not to slice all the way through.
05 - Stuff each chicken breast with the spinach and feta mixture, securing the opening with toothpicks if needed.
06 - Rub chicken breasts with the remaining olive oil, salt, black pepper, and paprika.
07 - Arrange stuffed breasts in the prepared baking dish. Bake for 25-30 minutes, or until the chicken is cooked through and juices run clear (internal temperature should reach 165°F).
08 - Remove toothpicks, rest for 5 minutes, then serve.