How to make purple marble cookies

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  1.Material preparation

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  2.Soften butter

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  3.After softening, add powdered sugar and stir evenly

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  4.This is stirred

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  5.Beat the egg liquid

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  6.Add the egg liquid in batches (stir evenly and smooth each time before adding the next time)

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  7.Add low-gluten flour (must be sieved before adding)

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  8.Stir until there is no dry powder

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  9.Take out one-third of the purple sweet potato flour and knead it into a ball

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  10. Knead the remaining two-thirds into dough

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  11. Roll the dough into sheets shape, put the original color below

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  12. Everything in half (same as the previous step, up to three times)

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  13.Mix the dough together and put it in the refrigerator for about an hour

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  14. Take out and cut into slices, put in the oven at 150 degrees for 7-8 minutes

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  15.After baking, take it out of the pan