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One may not eat bread, cake, or any baked goods (of the five grains) made by a non-Jew. However, if a Jew took part in the baking, such as being involved in lighting the fire, it is permissible. Where there is no Jewish baker, one may buy bread baked by a non-Jew as long as all the ingredients used in the bread are kosher. Since this is a commercial transaction rather than a personal interaction, we are not so concerned about a bond being formed between the baker and the Jewish customer. However, if baked goods made by Jews are available, as is the case in the State of Israel, one may not buy bread or baked goods from non-Jews unless a Jew was involved in the baking.
