Warm the milk with the butter in a container. Put the flour with the sugar and a pinch of salt in a bowl and mix together. Make a well in the middle, now carefully pour in the milk and crumble the yeast.
Mix the yeast in the liquid with a fork, add the egg and slowly work in half of the flour. Let rise in a warm place for about 30-40 minutes. When the pre-dough has risen nicely, knead in the remaining flour.
Grease a drip pan with butter. Preheat the oven to 180 ° C top / bottom heat.
Now work out the dough with your knuckles on the baking sheet. This is easier than rolling out the dough. Prick the dough several times with a fork.
Mix the sour cream with the sweet cream and 50 g sugar. Spread the butter in flakes on the dough and pour the sour cream on top. Sprinkle with 50 g of sugar. Now let it go for another 20 minutes.
Bake the cake at 180 ° C for 20 minutes, then set the oven to 250 ° C and brown the cake for about 5 minutes. Please observe as every stove is different. Now distribute the remaining 50 g of sugar over the hot cake.