If you turn a softwood chuck, spindle orientation, with a hollow approx size of the spoon bowl, then cut slots in the end, so you've in effect got a wooden collet chuck. Cut a larger slot in one side so the handle can stick out, and use elastic bands or a jubilee clip to tighten the jaws.
REMEMBER the jubilee and spoon handle WILL at least hurt, or seriously injure you if they catch your fingers. (hammer).
Like this; https://youtu.be/5TF2h4bAys4