Preheat oven to 180°C.
Place butter and golden syrup in a large pot on low heat and cook until melted, about 3 minutes. Remove from heat and add biscuit mix to pot, using a wooden spoon to combine.
Measure tablespoon amounts of mixture and roll into balls. If you like crispy ANZAC biscuits, squash them between your two palms to make a flat cookie. If you prefer them chewy, place the ball on the oven tray and press down slightly with a fork.
Bake, in batches, for about 10 minutes, until golden. Cookies will harden as they cool down.