Put the flour in a large bowl and make a well in the middle. Warm milk and 1 tablespoon of sugar lukewarm. Crumble in the yeast and then pour it into the well. Mix with a little flour. Cover and let rise for about 10 minutes.
Add 2 tablespoons of sugar, egg yolk, butter and salt to the pre-dough and knead everything together. Cover and let rise in a warm place until the batter has doubled.
Grease a round tray. Mix the sour cream with the whipped cream. Knead the dough again and roll it out into a round shape. Line the mold with it and pull it up a little at the edge. Pour the cream mixture on top. Mix 2 tablespoons of sugar with the cinnamon and sprinkle on top.
Let rise in a warm place for another 10 minutes.
In the preheated oven
Electric stove: 200 ° C
Circulating air: 175 ° C
Gas: level 3
Bake for about 20 minutes. Allow to cool in the mold