Preheat oven to 180 degrees Celsius. Line a muffin pan with oil/ non-stick muffin cups.
Combine all ingredients into a bowl for the 'base' recipe, then stir in added extras according to the flavour of choice
Pour batter into the muffin tray, and top with extra toppings if desired
Bake for roughly 10-12 mins, muffins should be a slightly underdone.
Take out oven and allow to cool, before transferring into an airtight container. Store in fridge overnight to firm up and enjoy!