Thanks AhChern for sharing this recipe.
Ingredients :
Part A : ( mixed the below in a small bowl and leave for ½ hour )
4 teaspoon ( tsp) dried yeast
5 tsp self raising flour
5 tsp warm water
Part B :
360g sugar
500g self raising flour
2 eggs
250ml thick santan ( coconut milk)
500g sweet potato – shred , steam then mashed ( you can replace this with pumpkin)

Method :
1.Beat sugar and eggs until frothy, add in Part A. Mix well.
2. Pour in thick santan and mix
3. Add in mashed sweet potato. mix
4.Fold in self raising flour
5. Pour the ingredients into ceramic cups

6.Steam for ½ hour

Tips :
I was told the secret to making the cakes ‘crack’ - make an ‘X’ mark and cut across the batter with a knife coated with butter. It seemed to work .

Notes :
I halved the recipe and this made ~20 little cakes
I repeated the recipe using pumpkin, turned out good as well.