I would share with you this Japanese Steamed Cake/Bun, also known as Mushipan(蒸しパン) which is one of the healthy breakfast or tea-cake that contains no butter or oil in the ingredients.
Sift flour and baking powder in a bowl. Set aside. At the same time, preheat a steamer/wok filled with water till boiling point.
Using a balloon whisk beat egg and sugar together till foamy and pale in colour before adding in oil and stir till combined.
Next divide the sifted flour into two batches, stir in alternately with water to form a smooth batter.
Lastly stir in 2/3 of the sweetcorn kernels and reserve the rest as toppings.
Spoon the cake batter evenly into 4 prepared foil/ramekins cups that are lined with paper liners.