01 - Preheat oven to 400°F for optimal baking conditions.
02 - Combine cream cheese, Parmesan, mozzarella, spinach, artichoke hearts, garlic, and red pepper flakes in a medium bowl. Mix until thoroughly blended and smooth.
03 - Pat chicken breasts completely dry with paper towels. Using a sharp knife, cut a deep horizontal pocket into each breast, taking care not to cut through to the other side.
04 - Rub each chicken breast evenly with olive oil, then coat with salt, black pepper, and smoked paprika on all surfaces.
05 - Divide the spinach-artichoke filling evenly among the four chicken breasts, stuffing each pocket. Secure openings with toothpicks to prevent filling from escaping during cooking.
06 - Heat 1 tablespoon olive oil in a large oven-safe skillet over medium-high heat. Sear stuffed chicken breasts for 2-3 minutes per side until golden brown crust forms.
07 - Transfer the skillet directly to the preheated oven. Bake for 20-25 minutes until chicken reaches an internal temperature of 165°F and juices run clear.
08 - Remove from oven and let chicken rest for 5 minutes to allow juices to redistribute. Carefully remove toothpicks and garnish with fresh chopped parsley before serving.