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Preheat the air fryer to 160°C (320°F) and set the timer for 20 minutes. Grease and line a suitable baking tin with nonstick baking paper. I use a 20cm (8″) square tin in my air fryer, but you may need to use a different size tin.
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In a large saucepan, melt the butter, sugars and golden syrup together on a low heat, mixing with a wooden spoon to prevent it from sticking to the bottom of the pan.
225 g Butter, 100 g Demerara Sugar, 100 g Light Brown Sugar, 5 tablespoon Golden Syrup
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Stir in the oats and vanilla extract.
360 g Oats, 1 teaspoon Vanilla Extract
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Spoon the flapjack mixture into the prepared tin and press down firmly with the back of a spoon. Air fry for 16-20 minutes..
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Allow the flapjack to cool in the tin for at least 2 hours (preferably overnight), before cutting them into squares with a sharp knife.