以英鎊和便士計算，漲幅最大的是品牌黃油，一桶500克的Anchor Spreadable在兩年內上漲了1.31英鎊，一桶500克的Lurpak Spreadable Slightly Salted上漲了1.17英鎊。
The consumer group's findings suggest that the price of some of Britain's favourite branded products might be rising more quickly than the overall cost of living, which is going up at its fastest rate in 40 years.
It found that the price of a 400g can of Classic Cream of Chicken Soup by Heinz also went up an average of 46% or 44p across the board from around £1 to almost £1.50.
One of the biggest increases seen in pounds and pence was on branded butter, with a 500g tub of Anchor Spreadable up by £1.31 over the two-year period and a 500g tub of Lurpak Spreadable Slightly Salted up by £1.17.
Sue Davies, head of food policy at Which?, said: "Our research shows the shocking rate of inflation on some of the nation's favourite branded foods, which is much higher than the national average and highlights why it is so important for retailers to provide people with a choice of product ranges."
While shoppers could save money by shopping around, people could be paying over the odds if they live in areas not well served by a choice of larger supermarkets or retailers that do not stock cheaper own-brand and budget ranges.
It warned that prices may continue to climb, with its head of retail and consumer insight Fraser McKevitt saying it was "too early to call the top" of where costs might peak.
For months, food manufacturers have been warning that they would need to increase prices because of the cost of raw materials and energy going up, partly due to the ongoing conflict in Ukraine.
In the summer, Tesco and Heinz had a dispute over the fact the US giant tried to boost the prices it was charging the UK's biggest supermarket, with some Heinz products even disappearing from the chain's shelves briefly.