Preheat oven to 160 C fan/ 180 C and grease and line a bread tin.
Place the butter, sugar and golden syrup together in a small saucepan and gently heat until everything has melted and is well combined.
Bring to a simmer and let the mixture simmer for a few minutes.
Stir in the granola and cacao nibs and stir so that the granola is coated.
Press the mixture into the prepared bread tin, smoothing over the top with the back of a spoon.
Bake in the centre of the oven for 15-20 minutes until golden.
Remove from the oven and score five cut lines along the top while it is still warm. Leave to cool completely in the tin before turning out and cutting into bars.
These granola bars will keep for a few days in an airtight container.