01 - Preheat the oven to 400°F (200°C). 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. Set aside.
03 - Pat chicken breasts dry with paper towels. With a sharp knife, cut a pocket into each breast without slicing all the way through.
04 - Rub each chicken breast with olive oil and the seasoning blend, ensuring the mixture reaches inside each pocket.
05 - In a mixing bowl, combine broccoli, cheddar cheese, cream cheese, Parmesan cheese, Dijon mustard, and minced garlic. Mix until thoroughly incorporated.
06 - Evenly distribute the broccoli-cheese filling among the chicken breasts. Stuff each pocket and secure with toothpicks if necessary.
07 - Place the stuffed chicken breasts on the prepared baking sheet in a single layer.
08 - Bake for 25 to 30 minutes, until the chicken is fully cooked (internal temperature 165°F / 74°C) and the cheese filling is bubbling.
09 - Allow the chicken to rest for 5 minutes before serving. Remove toothpicks before plating.