01 -  Pierce potatoes with a fork and bake at 400°F for 50-60 minutes until tender. Allow to cool slightly, then peel and roughly chop. 
 02 -  In a large heavy-bottomed pot over medium heat, cook chopped bacon until crisp. Remove with a slotted spoon and set aside on paper towels. 
 03 -  Drain off excess bacon fat, leaving 2 tablespoons in the pot. Add butter, then stir in onion and sauté until translucent, about 5 minutes. Mix in garlic and cook for 1 minute. 
 04 -  Pour in chicken broth. Add chopped baked potatoes to the pot. Simmer over medium heat for 10 minutes, stirring occasionally. 
 05 -  Using a potato masher or immersion blender, mash the potatoes in the pot until desired consistency is reached. 
 06 -  Reduce heat to low. Stir in whole milk, sour cream, and 1 cup grated cheddar cheese until smooth and heated through. Season with salt and black pepper. 
 07 -  Ladle soup into serving bowls. Garnish with reserved bacon, additional shredded cheese, scallions, fresh chives, and a dollop of sour cream.