As Sharlyne writes regular confectioner's sugar does contains corm starch which is not permissible during Passover, however there asre to companies that manufature potato starch based confectioners sugar for the Passover holiday; Haddar amd Mishpacha. If you are living in an area with a kosher supermarket you may be able to buy it there or request it for next year. To make your own confectioner's sugar you can combine sugar and potato starch in a blender. Place a cup of sugar minus one tablespoon into a blender (or a food processor) and add one tablespoon of potato starch. Pulse. It yields a cup of Passover confectioners' sugar. It will be more grainy than the regular product but it works fairly well as a stand in for some recipes.

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