Lastly, add in glutinous rice flour, whisk until well incorporated. The batter will be watery so don't have to be alarm. Use a soup ladle and fill the paper cup almost to the rim. The cake will sink down a little after you take it out of the oven.
Bake in preheated 350'F oven for 20-25 minutes or until tooth pick inserted in the center comes out clean. Cool on wire rack and store in air-tight container.