These popular chocolate bars, which have grown in popularity, were found to contain undeclared allergens such as peanut and sesame.
Rebecca Sudworth, FSA's director of policy, stated that these products do not comply with crucial safety and labelling regulations, posing a danger to allergic consumers.
The FSA is currently reviewing sampling data and advises consumers with allergies to avoid these chocolates as a precaution until full results are known.
The Chartered Trading Standards Institute (CTSI) highlighted that failing to declare allergens is illegal and highly dangerous, urging all food businesses to comply immediately.