Beat the 5 eggs until frothy, then add the flour. Stir the yeast into lukewarm milk and add to the egg and flour mixture.
Add sugar to the egg flour, add vanilla sugar and salt. Mix everything well. Let rise for about 20-30 minutes at room temperature
You need need a Pförtchenpfanne or Dutch Ableskiver pan to make the balls properly. They are available online and at kitchen stores.
Heat the pan on medium, grease the individual cavities with butter or oil with oil. Fill each cavity about 3/4 full and bake until golden brown. As they bake, turn each pancake ball with a meat fork or other tool so they are round and evenly baked.
Serve with powdered sugar. Also delicious with filled with apple sauce or spiced apples, plum jam, cherries, eggnog, Nutella, and so forth.