In a saucepan, combine brown sugar, cubed unsalted butter, golden syrup, and a pinch of salt. Heat until the butter is melted and the sugar is dissolved.
Add oats to the saucepan and mix until fully coated with the sugar and butter mixture.
Transfer the mixture to a lined flapjack tin, spread it out evenly, and bake at 150°C for 25-30 minutes.
Allow the flapjacks to cool in the tin for 10-15 minutes, then transfer to a chopping board and cut into 12 pieces.
Store the flapjacks in an airtight container for up to three to five days. Enjoy!
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