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How to bake the most delicious chocolate cookies

1. Soften butter, add sugar and beat until feathery. Mix in crushed yolk and beat well.

2. Mix in salad oil, sift in low powder and salt, mix well.

3. Put it into the mounting bag and squeeze it into the shape you like.

4. Put it into the oven with the temperature of 150 ℃.

5. Bake for about 15 minutes.