Crack an egg and mix with a fork. Divide the mixed egg so that 1/4 of the egg is in one bowl and the other 3/4th is in another bowl. In my case the egg was around 50g so I put 13g in one bowl and 47g in another bowl. Save this for later!
Melt the butter in a pan until liquid. Let it sit in the pan to cool and save for later.
In a medium size bowl put the sugar, cardamon, salt, and green tea powder and set aside.
Heat the milk until almost boiling and take it off of the heat. Put the milk in a large mixing bowl.
Add the sugar mixture(sugar, cardamon, salt, and green tea powder) to the heated milk. Mix thoroughly so that the the ingredients combine in the warm milk.
Check the temperature of the milk mixture with your hand. It should feel warm but not painful to keep your hand in. Add the dry yeast to the milk mixture. Note: make sure the milk is warm not hot so that it doesn't burn and kill the yeast!
Add the quarter of egg (13g) to the milk mixture.
Slowly start adding the flour. I would first add 1/2 and mix together. Then, add the rest slowly. Continue to check the consistency of the dough. It should be a soft dough but not dry. Note: at this point only mix, don't knead the dough!
Add the cooled melted butter to the dough and knead the dough. It should take about 5 minutes of kneading until the butter has incorporated into the dough.
Shape the dough into a bowl and put it in a large bowl. The dough should be elastic but soft!
Cover with a damp cloth or paper towel. Leave someplace warm and let it rise until it doubles in size. It takes about 30 minutes to an hour. Note: I usually fill a pot with warm water and put the bowl into the pot so that it rises quicker.