01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or apply a light coating of oil.
02 - In a small bowl, blend garlic powder, paprika, salt, and black pepper. Set aside.
03 - Pat chicken breasts dry, then use a sharp knife to cut a pocket horizontally into each breast without slicing all the way through.
04 - Rub olive oil onto each chicken breast and coat evenly with the prepared seasoning mixture, ensuring some seasoning is applied inside the cut pockets.
05 - In a separate bowl, combine finely chopped broccoli, shredded cheddar cheese, softened cream cheese, grated Parmesan, Dijon mustard, and minced garlic. Stir until thoroughly mixed.
06 - Fill each chicken pocket with the broccoli-cheese mixture, securing the opening with toothpicks if necessary.
07 - Arrange the stuffed chicken breasts on the prepared baking sheet. Bake for 25 to 30 minutes, or until chicken reaches an internal temperature of 165°F and the cheese is melted and bubbling.
08 - Let the chicken rest for 5 minutes. Remove any toothpicks before serving.