For those not in the know, a chiffon cupcake is a light and fluffy counterpart to the standard frosting-topped ones that are commonly found here in the United States. These chiffon cupcakes are a popular treat over in Asia (more specifically, Singapore, although the name of the recipe — Hokkaido — is Japanese.) The difference lies in the ingredients. These beauties only contain egg yolks, salt, flour, milk, vegetable oil, egg whites, cream of tartar and castor sugar. They have a castor cream filling and are topped with a dash of powdered sugar. Talk about different — and tasty!
Source Sugar and Everything Nice