Preheat oven to 400°F (200°C). Bake the potatoes for 45 minutes, until tender.
While the potatoes are baking, in a large pot, cook the bacon over medium heat until crispy. Remove bacon and set aside. Leave about 1 tablespoon of bacon drippings in the pot.
Add the diced onion to the pot and sauté until translucent. Add minced garlic and cook for another 1-2 minutes.
When the potatoes are done baking, let them cool slightly, then peel and cube them.
Add the cubed potatoes and chicken broth to the pot. Bring to a boil, then reduce to a simmer and cook for 15-20 minutes.
Remove pot from heat and use an immersion blender to blend the soup to your desired consistency.
Stir in the heavy cream, sour cream, and shredded cheddar cheese. Add salt and black pepper to taste.
Serve the soup hot, garnished with the crumbled bacon and chopped chives.