Does a product that contains bread crumbs in it (like a veggie burger) need to be Pas Yisroel?
Whenever the flour/bread component is only a minute amount of the recipe, then it is not considered pas akum. (It goes without saying that you must make sure there is no isur of bishul akum involved).
This only applies if the bread is for the first time baked together in the recipe. However, if the bread crumbs are first baked separately—as is almost always the case with bread crumbs—and only afterwards mixed in then there is an issue of pas akum. Nonetheless, even if the bread crumbs were first baked themselves, if it is afterwards mixed into a recipe in a way that it is not discernible anymore, then there is no issue of pas akum on this dish. If though the bread crumbs are still discernible, then they need to be removed.
Source:
שו״ע יו״ד סי׳ קי״ב סע׳ י״ד.
#1807