Day 1:
- Melt the butter, mix in sour cream, flour and egg yolks.
- Shape into small balls and leave in fridge until the next day.
Day 2:
- Beat the egg whites until frothy, add the crushed walnuts, sugar, vanilla extract and baking powder and mix gently.
- Roll the small balls until very thin, place about 1 to 2 teaspoons of the mixture on each dough, roll them up and seal the ends.
- Place them on a baking sheet lined with parchment paper.
- Bake at 180°C or 350°F until golden brown (20 to 30 minutes).
Dust with the confectioners sugar and serve.
Recipe Credit: Conceição Almeida
Photo Credit: theculturetrip.com