1. Put the butter in a container after softening and mix well with a rubber spatula
2. Stir well
3. Add powdered sugar
4. Stir evenly with a manual whisk
5. Add the egg liquid in two batches
6. Stir well every time
7. Sift in low-gluten flour
8. Use a spatula to mix into a dough without dry powder
9. Divide the dough equally into 5 portions
10. Add a drop of your favorite color to each serving and knead it with your hands
11. Make all five colors and put them on a chopping board covered with plastic wrap
12. Roll into a rectangle
13. After rolling them out one by one, put them in the refrigerator and freeze for 1 hour
14. After taking it out, return to room temperature slightly, and cut off the irregular parts with a knife
15. Then slice the dough and place it on a baking tray lined with tin foil
16. Preheat the oven to 160 degrees, put it on the middle of the oven, and bake for about 20 minutes
17. Finished product
Tips:1. This rainbow biscuit is just a way to teach you how to make it. If you don't like pigments, you can use various natural colored powders instead, such as matcha powder, cocoa powder, cherry powder, purple potato powder, etc.;
2. This amount can make 12 biscuits of the size shown in the figure.
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