1. Preheat for at least 10 minutes

2. Adjust the heat up and down at the same time according to the temperature in your recipe. Generally, chiffon cake is 175 degrees Celsius for one hour, and the baking pan is placed in the oven. Middle layer

3. Your batter is not done correctly. It may be that the egg whites are not beaten or there is too much water. It is recommended that you follow the recipe exactly and bake it on a non-removable baking pan.

Attached is a very good blog for teaching you how to make dim sum

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