
2 pounds russet potatoes
1 tablespoon olive oil
1½ ounces sliced prosciutto
1 large onion, chopped
4 cloves garlic, minced
1 tablespoon all-purpose flour
4 cups chicken stock
1 cup heavy whipping cream
1 pound Yukon gold potatoes, chopped
½ teaspoon salt
1 teaspoon chopped fresh thyme
½ teaspoon black pepper
1 pound aged white Cheddar cheese, shredded (about 4 cups)
Shredded sharp Cheddar cheese, for garnish
Sour cream, for garnish
Chopped chives, for garnish