01 - Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper or apply a light coating of oil.
02 - Combine garlic powder, paprika, salt, and black pepper in a small bowl and set aside.
03 - Pat the chicken breasts dry. Using a sharp knife, carefully create a pocket in each breast without slicing through to the other side.
04 - Rub olive oil over each chicken breast and coat both inside and out with the prepared seasoning mix.
05 - In a separate bowl, combine chopped broccoli, shredded cheddar cheese, softened cream cheese, grated Parmesan cheese, Dijon mustard, and minced garlic. Mix until evenly incorporated.
06 - Gently spoon the broccoli-cheese filling into each chicken pocket, securing with toothpicks as needed to hold the filling in place.
07 - Place stuffed chicken breasts on the prepared baking sheet. Bake for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the filling is bubbling.
08 - Allow the chicken to rest for 5 minutes after baking, then carefully remove toothpicks before serving.