The consumer group says many chocolate treats have shot up in price while several have been hit by "shrinkflation".
A steep fall in global cocoa production, driven by higher temperatures, is driving wholesale costs to a record high.
Easter eggs have become up to 50 per cent more expensive than last year while shrinking in size, a Which? investigation has found.
The Which? investigation found that at Tesco, a Twix white chocolate Easter egg had increased from £5 to £6 year-on-year, while also shrinking from 316g to 258g. In terms of price per 100g ...