Add the diced potatoes and low-sodium stock to the pot. Increase the heat to bring the soup to a simmer. Place a lid on the pot and reduce the heat to maintain a gentle simmer. Cook for 25 minutes or until the potatoes are very soft.
Turn off the stove. Using a stick blender, carefully puree the soup until just smooth.
Stir in the salt and black pepper, then mix in the heavy cream.
Preheat the oven to 180°C/350°F (160°C fan). Drizzle the bread pieces with melted butter or spray with olive oil. Bake for about 5 minutes until golden and crunchy.
Ladle the soup into bowls, drizzle extra cream on top, sprinkle with chopped chives, and scatter the crunchy croutons over it.
Notes
Enhance flavor with herbs or make it vegan by substituting ingredients.