Steps

1. First, prepare by setting size 8 paper cups and silicone cups together.
   🕒 01:54
2. Trim the ends of the sweet potato and peel it.
   🕒 02:08
3. Cut the peeled sweet potato into approx. 1cm thick slices, then into 1cm cubes.
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4. Soak the cut sweet potato in water for about 5 minutes to prevent browning.
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5. After 5 minutes, drain the sweet potato and place it in a heatproof bowl, lightly patting it dry.
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6. Add 1 tbsp sugar to the dried sweet potato, mix well, cover loosely with plastic wrap, and microwave at 600W for 2 minutes. (Key Tip!) Microwaving with sugar caramelizes the sweet potato, making it sweet and delicious.
   🕒 03:31
7. After 2 minutes of heating, remove the wrap and mix well.
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8. Re-cover with plastic wrap and microwave at 600W for 1 minute.
   🕒 04:08
9. After heating, remove the wrap, mix again until the sugar is well incorporated, and let it cool slightly. To prevent drying, cover the surface with kitchen paper while cooling.
   🕒 04:19
10. Crack 1 egg into a bowl and whisk well.
    🕒 04:45
11. Add 5 tbsp sugar to the whisked egg and mix quickly. (Key Tip!) If you don't mix the sugar into the egg immediately, it can absorb the egg's moisture and form lumps.
    🕒 05:00
12. Once well combined, add 1 tbsp vegetable oil and mix thoroughly.
    🕒 05:19
13. Add 100ml milk and mix well until the grittiness of the sugar disappears.
    🕒 05:31
14. In a separate bowl, gently mix the sifted 150g all-purpose flour and 2 tsp baking powder, being careful not to scatter the powder and avoiding lumps.
    🕒 05:48
15. Add 2/3 of the cooled sweet potato to the batter and mix well. Reserve the remaining 1/3 for topping.
    🕒 06:12
16. Pour the batter into the prepared paper cups, filling them to about 8-90% full, ensuring the sweet potato is evenly distributed.
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17. Arrange the reserved sweet potato pieces on top of the batter.
    🕒 07:02
18. Add about 1cm of water to the bottom of a frying pan and bring it to a boil.
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19. Once boiling, turn off the heat and arrange the cups in the frying pan.
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20. Turn the heat back on to bring it to a boil, then cover with a lid and steam over medium-low heat for 10 minutes.
    🕒 07:51
21. After steaming for 10 minutes, open the lid and insert a bamboo skewer into the center. If it comes out clean without any raw batter, they are done. If batter sticks, steam for a few more minutes.
    🕒 08:08
22. Carefully remove the steamed cakes, being mindful of the heat.
    🕒 08:26