01 - Preheat oven to 400°F. Lightly grease a 9x13-inch baking dish with olive oil or nonstick spray.
02 - In a small mixing bowl, combine the softened goat cheese, chopped chives, parsley, minced garlic, lemon zest, 1/4 teaspoon black pepper, and a pinch of salt. Stir until the mixture is smooth and uniformly blended.
03 - Using a small sharp knife, carefully cut a deep horizontal pocket into the thickest part of each chicken breast, taking care not to slice all the way through to the other side.
04 - Divide the goat cheese filling evenly among the four chicken breasts, spooning it into each pocket. Secure the openings with wooden toothpicks if needed to keep the filling contained during baking.
05 - Brush the outside of each stuffed chicken breast with olive oil, then season generously on all sides with 1/2 teaspoon salt, 1/2 teaspoon black pepper, and smoked paprika if using.
06 - Arrange the seasoned stuffed breasts in the prepared baking dish and bake uncovered for 25 to 30 minutes, until the internal temperature reaches 165°F and the juices run clear when pierced.
07 - Remove the baking dish from the oven. Discard any toothpicks and let the chicken rest for 5 minutes before slicing and serving.