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Heat the oven to 200C/180C fan/gas 6. Put the oats, butter, sugar and golden syrup in a food processor and pulse until mixed – be careful not to overmix or the oats may lose their texture.
Lightly butter a 20 x 20cm baking tin and add the mixture. Press into the corners with the back of a spoon so the mixture is flat and score into 12 squares. Bake for around 15 mins until golden brown.