01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease with oil.
02 - In a small bowl, blend garlic powder, paprika, salt, and black pepper until evenly mixed.
03 - Pat chicken breasts dry using paper towels. Carefully cut a deep pocket in each breast with a sharp knife, without slicing through completely.
04 - Rub each chicken breast with olive oil. Evenly coat with the seasoning blend inside and out, ensuring the pockets are well seasoned.
05 - In a mixing bowl, thoroughly combine chopped broccoli, shredded cheddar cheese, cream cheese, Parmesan cheese, Dijon mustard, and minced garlic.
06 - Gently stuff each chicken breast pocket with the prepared broccoli-cheese mixture. Secure the opening with toothpicks if necessary.
07 - Place the filled chicken breasts onto the prepared baking sheet, arranging them in a single layer.
08 - Bake for 25 to 30 minutes until the chicken is cooked through, reaching an internal temperature of 165°F, and the cheese is bubbling.
09 - Allow chicken to rest for 5 minutes before serving. Carefully remove toothpicks before plating.