Attention should be paid to keep the flour moisture sufficient, the intensity and time of kneading should be just right, and the potatoes should not be steamed too well.

The specific steps of making soft sweet potatoes are as follows:

1. Prepare the materials, and put all the materials except butter into the cooking basin;

2. Let it stand for a few minutes, stir it evenly with a scraper, press the small particles evenly, then let it stand for a few minutes and stir it evenly, so that the steamed potatoes are basically free of dry powder and particles;

3. Steam in the pot. After boiling water on a large fire, change to medium heat and continue steaming. The process takes about 20 minutes, and basically the batter can be solidified;

4. Take out the steamed potatoes and add butter while it is hot. Butter will melt naturally when it comes into contact with the freshly steamed batter;

5. After the butter is completely melted, stir the potatoes and the butter evenly with a spatula, put on disposable gloves and knead while it is hot, so that the potato batter can fully absorb the butter, then put the mashed potatoes into a fresh-keeping bag and continue kneading to further fully blend the potatoes and the butter;

6. After thorough cooling, prepare mashed potatoes for filling.