No, not quite. Icing sugar, also known as powdered sugar or confectioner’s sugar, is a sweetener made from granulated sugar and starch (typically corn starch) that’s been processed until fine and powdery. You can make powdered vanilla sugar if you'd like — the instructions are in the “optional variations” above. Then, feel free to use it as you would regular powdered sugar, but with a boost of delicious vanilla flavor!