Roughly chop the pistachios
In a large bowl, mix the oats, pistachios, maple syrup, oil and salt until thoroughly combined
Line a large roasting tin with baking parchment and layer on the granola mix, pressing into a rectangle about 2mm thick
Bake at 160°C for 12-15 minutes or until lightly golden brown
Remove from the oven and leave to cool for 20 minutes
Using a large solid spatula, break the granola into chunks of desired size
Transfer into a container of choice and enjoy
