CorningWare cookware has been around since the middle of the 20th century, although the pieces weren't considered collectible until the 1980s and 1990s. Vintage CorningWare usually has blue cornflowers on it, although some of the cookware has flowers in different colors. Some CorningWare had detachable handles that allowed you to transform the casserole dish into a pan. The handles either locked on or twisted on.
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Figure out which kind of detachable handle your CorningWare cookware has. The lock cookware has a lock that slides open to the remove the handle and shut to lock it on. Twist handles screw onto the pan.
Push the lock away from the pan and lift the handle from the pan to remove it. Place the new handle on the pan and push the lock toward the pan to lock it in place.
If the detachable handle is a twist-type handle, twist the handle off of the CorningWare cookware by turning it left. Twist a different handle in its place by turning the handle right.