Beat egg yolks; gradually add sugar, beating well. Add rice, flour, and baking powder, stirring well.
Beat egg whites (at room temperature) until stiff peaks form; gently fold into rice mixture just until the dry ingredients are moistened.
Drop mixture by tablespoonfuls into deep hot oil (375°); cook 1 minute or until golden brown. Turn and cook other side. Drain well. Sprinkle with powdered sugar. Serve hot.