Meanwhile, in a large bowl combine the ground chuck, Worcestershire and garlic powder. Shape into 4 large balls. Press a indent into the center of each ball and fill with blue cheese crumbles. Shape into a patty around the cheese so that it is completely enclosed and patty is about ½ inch thick. Grill burgers over medium heat for about 5 minutes per side or until desired doneness. Spread a thin layer of mayo on each bun, top with lettuce, burger and red onion marmalade. Serve and enjoy!