In a heatproof bowl, pour milk and sprinkle with sugar. Microwave to lukewarm, then sprinkle with yeast, stir. Let stand for 10 mins
In a separate bowl, mix 3 c flour with 2 tbsp soy milk powder (optional), 1 tbsp icing sugar and a pinch of salt.
Pour yeast mixture into flour mixture and knead
Cover with cling wrap and let stand for an H or until doubled in size
Once doubled, take about 35-45 g dough, flatten and fill , top with green onion sliced, seam to seal
Let rest for another half H
Meanwhile, preheat steamer
Steam buns for 5 mins