Preheat your oven to 160C Fan / 180C and prepare a 8 inch square tin with non stick baking paper - leave some overhang so you can lift the flapjacks out.
Place your butter, light brown sugar and golden syrup into a saucepan and melt till smooth. Remove from the heat and add in your gluten free oats. Mix in so all the oats are thoroughly coated.
Press the mixture into your prepared tin and bake in the oven for about 25 minutes until golden.
Remove from the oven and allow to cool in the tin to firm up before lifting out. Once completely cool, slice into squares or smaller squares for flapjack bites!
Notes
If you are using a 9 inch square tin your flapjacks will be thinner and need less time in the oven.
Remember you can mix these flapjacks up or even add some spice - maybe a tsp of ground ginger and some lemon zest?!