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Line a large baking tray with baking paper
Mix the oats, bananas and half the milk in a large bowl
If the flapjack mix seems dry, add more milk bit by bit, until the mix 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.
Bake in a pre-heated oven at 170°C for 35 minutes, or until they are starting to brown.
Remove from oven, slice into squares and leave to cool in the tray.