Steps:

• Heat a large skillet over medium heat. Add the bacon strips and cook until golden brown, 6-8 minutes. Remove to a paper towel lined plate. Reserve 2 pieces for garnish.  Crumble the remaining 4 pieces. 
  Place the crumbled bacon, potatoes, celery, leek, garlic, stock, salt, thyme sprigs, and pepper in the base of a 6- to 8-quart slow cooker. Put the lid on the slow cooker, and cook on high for 4 hours (or low for 6 to 8 hours) until the potatoes are tender when pierced with a fork.  Remove the thyme sprigs and discard. Use an immersion blender to blend the soup to a semi-smooth consistency, leaving small chunks of potato and vegetables for texture. Stir in the sour cream. (Add 1/4 - 1/2 cup of water, to thin the soup out to your desired consistency). Serve in bowls, garnished with cheese, chives, additional sour cream, and the reserved bacon slices crumbled over top. 

Steps:

• Peel potatoes and cut into 1/2-in. cubes; place half in a blender. Add broth; cover and process until smooth. Pour into a saucepan. Stir in sour cream, pepper and remaining potatoes. Cook over low heat until heated through (do not boil). Garnish with cheese, bacon and onion.