Suzanne, the cornstarch helps thicken the filling so that it coats the dough and remains creamy during baking. If you leave it out, it will still taste delicious but the consistency will be just slightly thinner. Other versions of this style of bread may not require the cornstarch if they call for a different combination of filling ingredients. (Sweet versions often use just brown sugar and cinnamon for example, which creates a liquidy, sticky pull-apart-style bread.) Happy baking! Kye@KAF

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