Cook the potatoes, uncovered, in boiling salted water for approx. 20 mins. until soft. Remove the potatoes, allow to cool slightly. Mix the flour, salt and yeast in a bowl. Add the sour single cream and water. Peel the potatoes, pass through a food mill and into the flour, mix and knead into a soft, smooth dough. Cover the dough and leave to rise at room temperature for approx. 1½ hrs.
To shape the bread
Knead the bacon, cheese and fried onions into the dough. On a lightly floured surface, shape the dough into approx. 20 balls, layer in the prepared tin. Cover the dough and leave to rise again at room temperature for approx. 30 mins.
Approx. 45 mins. in the centre of an oven preheated to 180°C. Remove from the oven, allow to cool slightly, remove from the tin and leave to cool on a rack.