Preheat Oven: Set your oven to 350°F.
Cook Pasta: Boil the pasta shells in salted water until al dente. Drain and set aside.
Make Sauce: Heat Alfredo sauce in a large pot. Season with pepper, then stir in Parmesan and mozzarella cheese until melted.
Add Chicken & Broccoli: Stir in the cooked chicken and broccoli, heating until warm.
Stuff Shells: Spoon the chicken mixture into each cooked pasta shell.
Serve or Bake: Place shells in a baking dish over extra Alfredo sauce if desired. Serve immediately, or bake covered for 15-20 minutes until heated through.
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