1. Ingredients for milky purple sweet potato mooncake: purple sweet potato, condensed milk, 4 eggs, 30 grams of sugar, 200 grams of milk, 50 grams of corn oil, and 100 grams of flour.

2. First prepare an appropriate amount of purple sweet potatoes, peel them and cut them into slices, then steam them in a pot.

3. To make the custard filling, first crack 4 eggs into a bowl, add 30 grams of sugar, 200 grams of milk, 60 grams of corn oil, mix thoroughly, and then add 100 grams of flour. Stir thoroughly.

4. Pour the batter into the non-stick pan and be sure to sift it to make sure there are no lumps. Then stir constantly over low heat until it solidifies slowly. When the shovel is no longer attached, set it aside to dry.

5. Divide the cooled custard filling into small balls.

6. After the purple sweet potatoes are steamed, put them directly into a large bowl. Mash the purple sweet potato into a relatively fine puree, then add some condensed milk, stir evenly, take an appropriate amount of the purple sweet potato puree and place it in the palm of your hand to form a ball.

7. Flatten the purple sweet potato ball and put in the custard filling. Tighten the mouth to wrap it up. Shape into a ball and press it into the mold. Just look like a mooncake.

8. In this way, the purple sweet potato mooncake is ready and very simple to make.