Cut parsnips and potato into one inch pieces. Place in large pot and cover with water. Add 1 tsp salt. Bring to boil over high heat.
Once boiling, lower heat and simmer for 12-15 minutes or until very tender. Drain.
Using a potato masher or food processor, mix together parsnips, potatoes, butter, heavy cream, remaining salt and sour cream.
Stir in bacon pieces and shredded cheese. Top with chopped chives just before serving.