To thaw the frozen brownies, take the block out of the freezer, carefully unwrap the wrappings. Cut yourself as many squares as you want with the help of a sharp, serrated knife. It will not be difficult to cut as even frozen, they will not be too hard. Wrap the rest of the slab carefully and put it back as it was into the freezer. Do this as quickly as possible. Then follow the rest of the steps as given before.