Slice off top of bread, reserving top. Carefully hollow out inside of loaf, leaving 1/2-inch shell. Cut removed bread into 1-inch cubes; reserve.
Filling: Combine cheeses and sour cream in bowl, stir in ham, onion, chilies and Worcestershire sauce. Spoon filling into hollowed loaf; replace top. Wrap loaf with several layers of foil, set on cookie sheet. Bake at 350° 40 minutes. Meanwhile, stir together bread cubes, oil and butter. Arrange on separate cookie sheet. Bake, stirring occasionally
until golden brown. Unwrap filled loaf, remove top, stir filling. Serve with bread cubes and