In a bowl, rub the butter into the flour until you get a homogeneous crumbly mixture.
Add the sugar, salt, and vanilla extract, then work in the yeast and sour cream.
Whisk the eggs, then mix them into the dough. Knead until the dough is elastic and smooth.
Cover the dough and let it rest in a warm place for at least an hour, or until it has doubled in size.
Once the dough has risen, roll it out to about 1 cm thickness, then cut out small round donuts.
Place the donuts on a baking sheet lined with parchment paper and let them rise for another 20 minutes.
Preheat the oven to 350°F (180°C) and bake the donuts for about 20-25 minutes, or until golden brown.
Meanwhile, chop the walnuts and mix them with the honey.
When the donuts are ready, spread them with the honey-walnut mixture, then sprinkle with powdered sugar and serve fresh.
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