Dissolve yeast in 2 tablespoon of warm water and let it rest for 5 minutes

Mix all the rest of the ingredients for the dough, then add the yeast

Form the dough into a ball, put it in a greased bowl, cover and let it rise for 90 minutes

Roll the dough out and cut it with a pastry cutter to form 8cm donuts (use a smaller pastry cutter to form the hole). You can use upsidedown glasses too, if you don't have pastry cutters

Make the donuts rest and rise for another 40 minutes

Fry two donuts at a time, for ~3 minutes, oil shouldn't be too hot (180°)

Pat the donuts dry with paper towels and let them cool down

Prepare the icing mixing milk and powdered sugar (add cocoa powder for the chocolate one or food coloring for different colors)

Dip one side of the donuts into icing, (you can add other decorations as chocolate letters or other decorations) and let them dry