Phyllo dough and puff pastry are both wonders of the frozen food world that help us create amazing pastries, tarts, and other baked goods at the drop of a hat. Of course, if you’re the ambitious type you can make them yourself, but the beauty of these is their convenience and ease — you can pluck them straight from the frozen case. Both doughs are flaky and delicious, but how are they different, and can they be used interchangeably?