Preheat oven to 150°c (with fan) or 170°c (without fan). Grease a 18cm/7inch square tin and line with baking paper.
Place butter, eggs and brownie mix in a large bowl and stir with a wooden spoon until just combined.
Spoon mixture into tin and smooth the top. Bake for 35 minutes or until a skewer inserted into the centre comes out with moist crumbs clinging. Let cool in tin completely.
Share your creation! Take a pic, upload to Facebook or Instagram and don’t forget to tag @locakoco and @180cakesau.
Contains: Tree nuts and Peanuts Manufactured in a facility that is free of Gluten
Sugar content naturally derived from ingredients. Excessive consumption may have a laxative effect. Xylitol is toxic to dogs, do not feed to your pets. Store in a cool, dry place.