Put the egg and sugar in a bowl, then mix with a whisk.
Add the vegetable oil and milk to Step 1 in that order, and mix together briskly. If using jam, mix it in here.
Add the cake flour and baking powder to Step 2 and use a spatula to mix it together quickly, ensuring that no lumps remain.
If you added jam, add the accompanying 1 teaspoon of milk.
If you want to add matcha or cocoa powder, mix in here (this is with matcha).
Pour the batter into the molds, then microwave the buns on the steam setting (put it on high if you can) for 15 minutes.
Once the bread has puffed up to about 1.5 times its original size, take it out of the microwave. Done!
This picture shows plain and strawberry bread (made with strawberry jam and a bit of food coloring, as the color wasn't very strong).
This picture is of plain and matcha bread.
Story Behind this Recipe
I wanted to create a quick breakfast.
After adding the flour, mix the batter with a spatula, taking care not knead or over-mix. The firmness of the batter will change with the addition of jam, so make sure to add just a little milk (the recipe says 1 teaspoon, though the amount required depends on the consistency of the jam).