Add raspberries to mixing bowl and mix until a puree is formed.
Weigh out flapjack and add to mixing bowl, mix for 1 minute on slow.
Scrape mix into a lined gastro tin, spread evenly and press down.
Leave to rest for 10 minutes.
Bake in the oven at 170oC for 30 minutes.
Cooking times and temperatures may vary depending on type of oven used.