Bake potatoes at 375° for 1 hour or until tender. Cool. Meanwhile, in a large skillet, cook the beef and onion over medium heat until the meat is no longer pink; crumble beef; 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, chiles, butter, Worcestershire sauce, salt, garlic powder and chili powder; mash or beat. Stir in meat mixture until combined. Stuff into potato shells.
Place filled potatoes on an ungreased baking sheet. Sprinkle with cheese. Bake at 350° for 10-15 minutes or until heated through.
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