Potato donuts - Donut kentang

Ingredients:

500 gm flour
350 gm cooked potatoes ( smashed until fine dough ) 
175 ml warm milk
1 1/2 tsp instant yeast
4 tsp sugar
100 gm melted butter
3 egg yolks 
1/2 tsp salt

topping: 
*melted chocolate chips
*slices almond
*confection sugar
*rainbow sprinkler  

instructions;

- in a big bowl, add flour, cooked potato, yeast, sugar,melted butter, egg yolk, salt and milk. stir the ingredients until blend. the dough should not be sticky and shaggy. 
- then transfer the dough mixture to work surface area,sprinkle a bit of flour over the dough. knead with your hand for about 20 minutes. it allows the yeast to work on dough.
- then put it back again in a bowl, covered with fabric. place it in a warm area for 1 hour to rest.
- after 1 hour later, take the dough in work surface with sprinkle of flour if too sticky. use a wood roller, then cut donuts with donuts cutter. repeat to all
- place them in the big tray and cover with kitchen towel. again, let donuts rest for another 20 minutes
- meanwhile, preheat your frying pan with enough oil. once the donuts enough to rest. start frying each donuts until golden brown for both side
- serve with your favorite topping.