1. Heat the butter until it melts, the temperature is not too high, add the powdered sugar and vanilla powder, and mix well with a whisk
2. Then add the egg whites, mix well and then add the sifted low-gluten flour, mix until there are no flour particles, scoop a little batter with a spoon, and place them on the baking tray evenly, with larger intervals
3. Use a spoon to gently spread the batter into a round shape and put it into the oven to bake. After the biscuits are colored, roll up the biscuits while it is hot, and let go after the shape is set.
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