Measure out milk powder in a skillet and toast over medium heat, continuously stirring until golden brown.
Heat up milk in a microwave for 30s. It should be hot but not unbearable to the touch. Dissolve condensed milk and sprinkle yeast on top. Let rest for 5 minutes or until foamy.
Add oil and toasted milk powder to the yeast mixture and then mix in flour and baking powder. Knead the dough until it is smooth and elastic. Let rest for 1 hour.
Prepare your steamer with parchment paper, steaming cloth/liner.
Transfer the dough onto your work surface and flatten. Using a rolling pin, roll the dough out into a rectangle. Take one side and tightly roll into a log. Slice into 5 even pieces and place them seam side down in the steamer.
Cover the steam basket and let the dough prove for 30-60 minutes.
Add water to a pot and turn your stove on high. Place the steam basket on top and steam for about 10-12 minutes. Turn off the heat and let the buns sit for about 5 minutes before serving.
Storage: You can freeze the buns once they have cooled. To reheat, just pop it back into the steam basket and repeat the steaming step.
Recommendation: enjoy the mantou fried and dipped in some condensed milk! #DoubleToastedUntraMilkyMantou