Preheat the oven to 375°F (190°C).
In a mixing bowl, combine chopped broccoli, cheddar cheese, cream cheese, garlic powder, onion powder, salt, and black pepper until well mixed.
Using a sharp knife, cut a pocket into each chicken breast without cutting through.
Fill each chicken breast pocket with the broccoli and cheese mixture.
Secure the openings with toothpicks if needed to prevent filling from spilling.
Heat olive oil in a large skillet over medium-high heat.
Sear the stuffed chicken breasts for 2-3 minutes per side until golden brown.
In a small bowl, mix breadcrumbs with melted butter until coated.
Place seared chicken breasts in a baking dish and sprinkle breadcrumb mixture evenly on top.
Bake in the oven for 25-30 minutes or until chicken is cooked through and internal temperature reaches 165°F (74°C).
Allow chicken to rest a few minutes before serving.
Serve with rice or your favorite vegetables.