Melt butter in a large saucepan. Add leeks and bacon and saute' until leeks are soft
Add potatoes to pan. Add stock and milk.
Bring to boil. Reduce heat and simmer covered for 1 hour. Cool slightly
Puree' with a stick blender in the pot or a blender in batches.
Reheat and add the cream. Do not boil.
Serve sprinkled with chives or parsley.
Notes
Yum Chicken stock can be swapped out for vegetable stockBeware of the salt content of commercial stocks. Use the best quality stock you can afford and if possible avoid cubed or powdered stocksIf you do not like pork products you can omit the bacon. I am not a big fan of meat substitutes so I would recommend to get that smokey flavour add a pinch of smokey paprika.