1/4 pound bacon, chopped into matchsticks
1 tablespoon butter
1 onion, diced
2 cloves garlic, minced
1 pound potatoes, peeled and diced
4 cups chicken stock
1 sprig thyme
1 cup half and half
1 cup shredded yellow cheddar
6 scallions, thinly sliced
3/4 cup sour cream
Salt and pepper
Scatter the bacon in a cold Dutch oven, then heat over medium heat, stirring occasionally, until the bacon has rendered its fat and is nice and crisp. Remove the bacon and set aside, leaving the fat in the pot.
Add the butter and the onion. Season with salt and pepper and cook, stirring occasionally, until soft and slightly browned, 12-15 minutes.
Add the garlic, potatoes, chicken stock and thyme. Bring to a boil, then reduce to a simmer and cook for 25 minutes or until the potatoes are very tender.
Remove the thyme. Add the half and half and blend the soup using an immersion blender until very smooth. Season the soup to taste with salt and pepper.
Ladle the soup into bowls. Garnish each with a sprinkling of reserved bacon, cheddar and chopped scallions, and a quenelle of sour cream (or serve the garnishes on the side and let people make their own bowl).