Angry customers have accused Cadbury's US owners of changing the taste of mini eggs.
Fans of the snack have claimed the chocolate inside now tastes 'cheap'.
Cadbury was taken over by American firm Kraft in 2010 which led to the production of mini eggs to be moved from Somerset to Poland.
Outrage: Suspicious chocolate fans have accused Kraft of tampering with the recipe of Mini Eggs
Chocolate lovers were outraged when Kraft's spin-off company Mondelez changed the recipe of Creme Eggs two years ago. The move reportedly lost £6million in sales.
One suspicious customer said of the Mini Eggs: 'The chocolate and candy coating taste bland, like a cheap knock-off.'
While another said: 'The shell has lost its crunch. It best not be another recipe change.'
Chocolate expert Angus Kennedy told The Sun that the change in taste could be down to rising cocoa prices.
He said: 'Many chocolate products taste suspiciously sweeter than they used to. Because the price of cocoa has been soaring to record highs, producers have been forced to make products with more sugar (less expensive) and less cocoa.'
Chocolate expert Angus Kennedy said high cocoa prices have caused producers to use more sugar instead
A spokesman for Kraft said the fundamentals of mini eggs remain.
Cadbury's owners also caused controversy in 2013 when they changed the shape and weight of the iconic Dairy Milk bar after more than a century.
The American company introduced round edges to the bar while also reducing its weight by 4g.