2. When making the helmet, roll the dough as thin as possible, so it will be more brittle when baked. According to the size of the pot helmet, bake it in the oven for 10-20 minutes, and preheat the oven for about 3 minutes in advance, otherwise the pot helmet will be directly put in, and the shell will easily collapse. Also pay attention to brush the baking pan with oil, otherwise the dough will stick to it.