This Space Ball Stellaron toy is actually meant for fetching, but we have used it as a treat dispenser.
I wired two semi-moist duck fillets and a semi-moist chicken fillet (which I had cut into strings) around the toy’s holes. You can also use slices of cheese or slices of ham.
It took Miki about 2 to 3 minutes to get the treats out.
I used this toy also in the game Fleece wraps:
and this toy has been used to make the Kong Wobbler toy more difficult: