Let the potatoes cool down a little, remove the peel and turn into a puree in a convenient way for everyone: grate, pass through a meat grinder, rub with a pestle. I interpreted it with a button. You can't make mashed potatoes in a blender! Instead of mashed potatoes, you will get pasta. Beat the egg into the mashed potatoes, mix, add salt and flour. Knead the dough in a bowl and spread it over a work surface sprinkled with flour. When kneading potato dough, there is one feature: the dough cannot be stretched like a regular yeast dough, it can only be rolled and pressed.