01 - Preheat your oven to 390°F.
02 - Using a sharp knife, make deep cuts about ½ inch apart across each chicken breast, being careful not to cut all the way through the meat.
03 - In a mixing bowl, combine the shredded mozzarella cheese, baby spinach, chopped sun-dried tomatoes, and minced garlic until well incorporated.
04 - Gently press the filling mixture into each cut of the chicken breasts, ensuring even distribution.
05 - Place the stuffed chicken breasts in a baking dish. Drizzle evenly with olive oil and sprinkle with Italian herbs, paprika, salt, and black pepper.
06 - Bake for 25 to 30 minutes until the chicken is fully cooked through (internal temperature reaches 165°F) and the filling is golden and bubbly.
07 - Let the chicken rest for 5 minutes before serving to allow juices to redistribute.