01 - Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper or apply a light layer of oil.
02 - In a small bowl, mix garlic powder, paprika, salt, and black pepper. Set aside.
03 - Pat chicken breasts dry. With a sharp knife, carefully create a pocket in each breast, ensuring not to slice all the way through.
04 - Brush each chicken breast with olive oil, ensuring even coverage inside and out, then rub with the prepared seasoning blend.
05 - Combine chopped broccoli, shredded cheddar, softened cream cheese, grated Parmesan, Dijon mustard, and minced garlic in a mixing bowl. Stir until well blended.
06 - Spoon the broccoli-cheese mixture into each chicken pocket. Secure with toothpicks if necessary to retain the filling.
07 - Place filled chicken breasts on the prepared baking sheet and bake for 25 to 30 minutes, or until chicken is thoroughly cooked and cheese is melted and bubbling. Internal temperature should reach 165°F (74°C).
08 - Allow chicken to rest for 5 minutes. Remove toothpicks before serving.