The resulting quantity was for two normal cake trays, but I have some large trays, so I put the whole amount in one tray and a large, fluffy loaf came out.
How I did it: I put the peeled and boiled potatoes in enough water to cover them with salt.
When they boiled well as for the puree, I drained them and put them directly in the bowl in which I kneaded the bread and passed it together with the butter.
I rubbed the yeast with a spoonful of sugar until liquefied, then I diluted it with warm milk and immediately mixed it with the warm potatoes. I added enough flour to form the mayo like a thick cream, I covered the bowl and let it rise for 10 minutes, then I put the potato juice, I adjusted the salt and I started to incorporate the flour, I kneaded and left he increased it again for 15 minutes, until it doubled in volume.
I greased the pan with oil, braided the dough and placed it in the pan. I left it covered in the pan for another 10 minutes, after which I baked at 180 degrees for 40 minutes.
A few minutes before the end I took out the bread and greased it with yolk mixed with a little milk and put it back in the oven.
The dough grew a lot and fast, I don't know if it was the potato intake, but I was very happy with the success!