Israeli crisped rice is made from edible rice. In Israel the issue is mute due to the fact that the workers are Yehudim and the product is bishul yisroel . If a product is disqualified due to bishul akum , the utensils are also considered non-kosher and have to be kashered . If stoneware or teflon-coated utensils were used, one should ask his Rav for guidance on kashering . As previously mentioned, when an observant Jew has played an integral part in the food preparation, that product is known as food that has been prepared through bishul yisroel, literally, food cooked by an observant Jew.
Notable exceptions are bread products that are baked commercially.
Bread and cake products have separate laws governing their use. The food is placed in a cold stove or cooking apparatus and then the Yehudi lights the fire. The fire or pilot light in an empty oven is first lit by the Yehudi and remains lit continuously. After being lit the food can be placed inside by anyone. The first method is the optimal one.