Bake potatoes at 375 for 1 hour or until tender. Cool.
Meanwhile, in a large skillet, cook the beef & onion over medium heat until the meat is no longer pink; drain.
Cut a thin slice off the top of each potato. Carefully scoop out
pulp, leaving a thin shell; place pulp in a bowl.
Add sour cream, chilies, butter, Worcestershire sauce, salt, garlic
powder & chili powder; mash.
Stir in meat mixture until combined. Stuff into potato shells.
Place on an ungreased baking sheet. Sprinkle with cheese.
Bake at 350 for 10 minutes or until heated through.