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Line a large baking tray with baking paper
Mix the oats and whey powder in a large bowl
Add peanut butter, half the milk and mix
Add the honey and chocolate covered raisins. Stir until fully mixed in
Top tip: If the flapjack mix seems dry, add the rest of the milk, little by little, until you are able to push down on the mix, so it just holds together. You do not want it to be too wet.
Spread the flapjack mix evenly across the paper and press it down into the tray. We like our flapjacks to be around 2cm thick, but you may prefer them thicker or flatter!
Place in the fridge for 1 hour, this helps the mixture to hold together better.
Top tip: If you're pushed for time or happy for your flapjack to be a little crumbly, feel free to skip this step.
Bake in a pre-heated oven at 180°C for 15 minutes
Remove from oven, slice into squares and leave to cool in the tray