Yeast: If making the dough with fresh or active dry yeast, mix the lukewarm milk and the crumbled fresh yeast (or sprinkle the active dry yeast in the milk) in a small bowl and stir until the yeast dissolves.
Place the flour into a large bowl and make a well in the middle. Pour the milk-yeast mixture into the well and mix it with a little flour.
If using instant yeast, mix the flour, sugar, and salt with the instant yeast. Add the milk and continue with the recipe.
Add the eggs and the very soft butter.
Knead for about 5 minutes using the kneading attachments of you hand-held mixer. The dough should be smooth and soft, you will not be able to knead it with your hands.
Let rise: Cover the bowl with a kitchen cloth and let the dough rise in a warm place. It should double in size, this will take about 30 to 40 minutes, depending on the type of yeast you are using and on the temperature in your kitchen. Keep checking.
Line a springform pan (diameter 26 cm/ 10 inches) with baking paper, bottom, and walls of the pan.