Follow these steps to create your Broccoli and Cheese Stuffed Chicken:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Chicken: Using a sharp knife, create a pocket in each chicken breast by cutting horizontally, making sure not to cut all the way through.
3. Steam Broccoli: In a small pot, steam the broccoli florets until tender, about 3-5 minutes. Drain and set aside.
4. Mix Filling: In a bowl, combine the steamed broccoli, shredded cheddar cheese, cream cheese, garlic powder, onion powder, salt, and pepper. Mix until well combined.
5. Stuff Chicken: Fill each chicken breast pocket with the broccoli and cheese mixture, using toothpicks to secure if necessary.
6. Coat with Breadcrumbs: In a shallow dish, pour the breadcrumbs. Dip each stuffed chicken breast in olive oil, then coat with breadcrumbs, ensuring even coverage.
7. Bake: Place the stuffed chicken breasts on a baking sheet lined with parchment paper. Bake for 30-35 minutes, or until the chicken is cooked through and the breadcrumbs are golden brown.
8. Garnish: Once cooked, remove from the oven and let rest for 5 minutes. Garnish with fresh parsley, if desired.
9. Slice and Serve: Carefully remove the toothpicks, slice the chicken, and serve warm.

These detailed steps will guide you in creating the most delicious Broccoli and Cheese Stuffed Chicken with ease.