Crumble the yeast into a bowl, add sugar - mix, pour in milk and stir until a uniform liquid is obtained.

Cover the bowl with a cloth or cling film and set aside in a warm place for about 20 minutes - for the yeast to start working, rise and become fluffy.

Add flour, sugar, and egg yolks to the mixer bowl.

Pour in the yeast starter and begin kneading the dough.

Knead the dough for about 10 minutes - until it becomes elastic.

Add vodka to the dough.

Pour in the melted butter and knead for a few more minutes.

Cover the bowl with the dough with a cloth or cling film and set aside in a warm place for about an hour to rise - the dough should double in volume.

Briefly knead the risen dough again.

Using a kitchen scale, divide the dough into 9 equal portions - each approximately 60 g.

Roll the pieces of dough into balls - try not to add flour, so the donuts don't become hard later.

Additionally, flatten each ball firmly with your hand.

Cover the prepared discs with a cloth and set aside for about 30 minutes to puff up.

Towards the end of the donuts' proofing, heat the oil well in a larger pot - ideally to a temperature of about 170 degrees.

Add 3-4 donuts to the hot fat and fry for about 2-3 minutes on one side.

Carefully flip the donuts to the other side and fry them again for about 2 minutes - you can check with a toothpick inserted into the center of a donut if they are cooked through - the toothpick must be clean, without sticky dough.

Remove the finished doughnuts onto a plate lined with paper towels to drain them of excess fat.

Transfer the cookie cream to a bowl.

Briefly warm it up in the microwave (approx. 30 seconds) - to make it more liquid.

Transfer the cream to a piping bag fitted with a small round nozzle.

Insert the nozzle into the center of the doughnut (from the side) and squeeze out some cream.

Pour the powdered sugar into a bowl.

Add milk to it in portions, stirring constantly, until you get a smooth and quite thick glaze.

Drizzle the doughnuts with glaze - it's best if they are already slightly cooled.

Finally, you can additionally sprinkle the doughnuts with crushed cookies.