In a large pot or Dutch oven set over medium heat, cook the diced bacon until crispy, about 8 to 10 minutes. Use a slotted spoon to transfer the bacon to a plate and set aside, leaving about 2 tablespoons (30 ml) of rendered fat in the pot.
4 slices (120 g) bacon
Add the chopped onion to the pot and cook, stirring occasionally, until softened, about 5 minutes. Stir in the minced garlic and cook for 1 minute more, just until fragrant.
1 small yellow onion, 3 cloves garlic
Add the cubed potatoes, chicken broth, salt, and black pepper. Increase the heat and bring the mixture to a boil, then reduce to a steady simmer. Cook uncovered for about 20 minutes, or until the potatoes are very tender and easily pierced with a fork.
2 lbs (907 g) Russet potatoes, 5 cups (1.2 L) low-sodium chicken broth, 1 tsp (6 g) kosher salt, ½ tsp (1.5 g) black pepper
Use an immersion blender to partially or fully purée the soup directly in the pot, depending on your preferred texture. For a chunkier soup, blend lightly, leaving visible pieces of potato. For a smoother consistency, blend longer. If using a countertop blender, blend the soup in batches rather than all at once. Hot soup releases steam, and blending in smaller batches prevents pressure buildup and splashing. Leave the blender lid slightly vented and cover with a towel while blending, then return the soup to the pot.
Stir in the milk, sour cream, shredded cheddar cheese, and butter. Simmer gently over low heat, stirring often, until the cheese is fully melted and the soup is smooth and creamy. Avoid boiling after adding the dairy, as high heat can cause separation and affect the texture.
1 cup (240 ml) whole milk, 1 cup (240 g) full-fat sour cream, 1 cup (113 g) sharp cheddar cheese, 2 tbsps (28 g) unsalted butter
Taste and adjust seasoning with additional salt and black pepper if needed. Serve hot, topped with the reserved crispy bacon, scallions, chives, sour cream, and extra shredded cheese as desired.
cooked bacon, sliced scallions, chives, additional cheddar cheese, sour cream