Heat the oven to 170°C/gas mark 3½.

Grease a baking tray (approximately 26cm x 16cm) with butter.

Put the butter, syrup and sugar in a saucepan and heat gently; stirring to melt and combine the ingredients.

Add the rolled oats and mix together well.

Empty the mixture into the tray and flatten out with the back of a spoon.

Bake for 25-30 minutes until golden brown. (It will still be soft to the touch; they firm up as they cool down.) Err on the side of under-cooked if you aren't sure otherwise they go crunchy!

Let the flapjacks cool for 5 minutes and then mark into pieces (I made 12 but mine are quite large!).

Leave to cool in the tray.