In a large dutch oven cook bacon until crisp. Remove to a plate lined with paper towels and set aside.
Add leeks, onion and celery to bacon drippings in dutch oven.
Season with salt, pepper and thyme.
Add butter and flour and stir about a minute.
Whisk in chicken broth and add potatoes.
Simmer and cook potatoes for 15 -20 minutes until tender and soup is thickened.
Using an immersion hand blender (see note), blend soup to liking.
Serve with toppings.
Notes
Weight Watchers PointsPlus: 4**If you do not have an Immersion blender, carefully pour half of the soup into a blender. Release one corner of lid (to prevent vacuum effect that can create an explosion) and place a clean towel over machine before pulsing.