Preheat the oven to 150 C / 300 F (I used the fan because I had 2 trays going at the same time)
In a large bowl mix the cinnamon and nuts with the oats. Add the vanilla extract to the melted butter and pour into the oat mix. Add the heated honey and mix it all together with a wooden spoon until well combined.
Tip the mix onto two large baking sheets lined with silicone or baking paper spread out and bake for around 35 – 40 minutes until golden brown. I turned the trays around halfway through and gave the granola a good toss around