Preheat your oven to 350°F (175°C). Cook the large pasta shells in salted boiling water until al dente, then drain and rinse with cold water.
In a large mixing bowl, combine the cooked chicken, steamed broccoli, softened cream cheese, shredded cheddar cheese, garlic powder, onion powder, salt, and pepper. Mix until well combined.
Stuff each cooled pasta shell with the chicken and broccoli mixture and place them seam-side up in a greased baking dish.
In a separate bowl, mix chicken broth with olive oil, and season with salt and pepper. Pour this mixture over the stuffed shells.
Sprinkle grated Parmesan cheese over the stuffed shells.
Cover the baking dish with aluminum foil and bake for 25 minutes. Remove the foil and bake for an additional 10-15 minutes until heated through and cheese is bubbly.
Garnish with chopped fresh parsley and serve warm.
Notes
This recipe is versatile; feel free to customize the filling with different vegetables or cheeses based on your preferences.