Preheat the oven to 160°C.
Combine all dry ingredients, except salt, in a bowl and mix.
Place the nut butter, maple syrup and sea salt in a small bowl, and mix until well combined.
Pour the maple syrup mixture into the dry ingredients. Stir well until the granola is well coated and sticky.
Line a baking pan with baking paper, and spread granola mixture into one layer on the pan. Sprinkle with a good pinch of additional sea salt.
Bake in the oven for 10 minutes.
Remove from the oven, stir, and then place back in the oven for a further 5-10 minutes, depending on how golden you like your granola.
Remove from the oven and allow to cook completely to room temperature.
Break the granola into bite-sized chunks and store them in an airtight container. They can be consumed for up to two weeks.