01 - Set the oven to 400°F and prepare a baking sheet with parchment paper or a light coating of oil.
02 - Combine garlic powder, paprika, salt, and black pepper in a small bowl and reserve.
03 - Pat the chicken breasts dry and use a sharp knife to carefully slit a pocket into each piece without slicing through completely.
04 - Rub the outside and inside pockets of each chicken breast with olive oil and the prepared seasoning mix.
05 - In a mixing bowl, blend chopped broccoli, cheddar cheese, cream cheese, Parmesan, Dijon mustard, and minced garlic until uniform.
06 - Evenly fill each chicken pocket with the broccoli cheese mixture and secure the opening with toothpicks if needed.
07 - Place the prepared chicken breasts onto the baking sheet in a single layer.
08 - Bake for 25 to 30 minutes, until the chicken is cooked through (internal temperature reaches 165°F) and the cheese is bubbling.
09 - Allow the chicken to rest for 5 minutes before removing toothpicks and serving.