Parmesan

Parmigiano Reggiano is the most imitated Italian cheese in the world.

An excerpt from the article 18 facts about Parmesan

The phenomenon of counterfeiting is widespread in the United States, the first non-EU market for this cheese with exports worth $150 million per year. In the United States, several companies sell a cheese similar to Parmigiano called Parmesan. The main North American producer of Parmesan is Kraft Foods.