Preheat oven to 180 degrees celsius. Line and grease a brownie tin OR roasting tray.
Mix all ingredients above in a bowl until well combined. It may look a little dry at first, but keep mixing and it should combine well (If it still seems a bit dry, it may be because of your nut butter type so you may add 1-2 tbsp milk of choice)
Place mixture into the tray/tin, and press down with a spatula, spreading evenly.
Top with desired toppings ( as mentioned above).
Bake in the oven until golden brown ( takes between 20-30 mins)
Allow to cool slightly before cutting Store in an airtight container and enjoy!