Preheat your oven to 160C (320F) (I used a fan forced oven - set to 180C (356F) for conventional oven).
Grease a jumbo 6 hole muffin tin with butter and set aside.
Set aside 100g of granola to top the muffins (so you only need to add 100g to the actual muffin mix).
Add all of the dry ingredients to a large mixing bowl and stir well to combine.
In a separate bowl, add all of the wet ingredients and whisk until well combined.
Make a well in the centre of the dry ingredients and pour in the wet ingredients.
Mix until just combined (a little dry flour is perfectly ok). Don't over mix or you'll get tough muffins.
Spoon the muffin mixture into the muffin tin (I've filled them to the top for a jumbo bakery style muffin).
Sprinkle the muffins with the remaining 100g of granola (fine crumbs are best for this).
Bake for approximately 25 minutes at 160C (320F) or until golden brown.