Ingredients
Method
- Melt butter in a large pot over medium heat. Sauté onion and a pinch of salt until soft, about 5 minutes. Stir in garlic and cook 30 seconds.
- Pour in broth and add mashed potatoes. Whisk until potatoes dissolve. Bring to a gentle simmer and cook 10 minutes.
- Blend with an immersion blender until smooth, about 1 minute, or leave chunky if you prefer.
- Reduce heat to low. Stir in milk and cheddar until melted, 2 to 3 minutes. Do not boil. Adjust salt and pepper.
- Ladle soup into bowls and top with bacon, scallions, sour cream, and extra cheese. Serve immediately.
Notes
Leftover mashed potatoes that contain cream cheese or sour cream work wonderfully here; they add extra richness. If you like a thinner soup, stir in an extra 1/2 cup broth or milk after adding the cheese.
