"These two spellings are largely interchangeable, but by far the most common is 'cannot' and you should probably use it except when you want to be emphatic: 'No, you can not wash the dog in the Maytag.'"
If you go to the link, it's clear she made this very impressive treat for Hanukkah, not Passover (beyond the fairly obvious fact that many of the ingredients are not Kosher for Passover). Since both holidays are eight days long, your post is confusing.
"flat bread traditionally eaten during Hanukkah" Matzoh is not traditionally eaten during Chanukah. It is almost exclusively eaten during Passover. Some of those houses have non kosher-for-passover ingredients but it is still not a Chanukah dish.
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http://www.wsu.edu/~brians/errors/cannot.html