1, no bubble.

2. Sweet potato flour is more difficult to cook, so the cooking time will be more difficult than other kinds of flour. It usually takes about 10 minute to cook completely, but it should be noted that the cooking time should not be too long, otherwise the taste will be too soft and sticky, and it will easily go bad, reducing the taste and nutritional value.

3. In addition, most of the sweet potato powder sold in the market is hard and basically needs to be soaked for a while before cooking. It is best to use water with a water temperature of 50℃, which can shorten the soaking time and basically soak for about 20 minutes. You can cook it directly.