The chicken would have been distributed to citizens under the communist-run island's ration book system, which provides subsidised food and is an integral part of daily Cuban life. But it's thought thieves sold the chicken - to buy laptops and TVs.
I thought about going with "Royale with chicken" as opposed to "Royale of chicken", but I went with the second because I thought that the Royale is already intended to be a quarter pounder of beef and it might have seemed beef+chicken instead of a quarter pounder of chicken 😁