Walnuts are crushed into small pieces in any convenient way (with a rolling pin I did). But not into flour.

All products must be room temperature! and then the butter will curdle. Although the taste is not affected. Softened butter, mix with sugar and vanilla sugar as best as possible. 5 minutes. With a mixer I did. Add eggs and sour cream. Then chopped nuts.

And then add the sifted flour with the baking powder. The dough should get like sand and not stick to hands. Add the flour gradually. Until the dough has reached the desired consistency, because the flour is different for everyone. Remove the resulting dough in a bag and put in the fridge for 20 minutes.

Cinnamon mixed with sugar (had brown sugar for those who don't like cinnamon)

Remove the dough from the refrigerator and pinching off bits off, roll balls about the size of a walnut. Roll in sprinkles. Spread on silicone Mat (or on a baking sheet, greased or parchment, greased). Balls slightly flatten. To put at a distance of 2-3 cm from each other. Put in a preheated 200 degree oven. Bake for 10-12 minutes. Not desiccate.

Enjoy your tea!

Here's ruslanchik)