Loaded Potato Soup

INGREDIENTS

• 4 (6-ounce) red potatoes
• 2 teaspoons olive oil
• 1/2 cup prechopped onion
• 1 1/4 cups fat-free, lower-sodium chicken broth
• 3 tablespoons all-purpose flour
• 2 cups 1% low-fat milk, divided
• 1/4 cup reduced-fat sour cream
• 1/2 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 3 bacon slices, halved
• 1.5 ounces cheddar cheese, shredded (about 1/3 cup)
• 4 teaspoons thinly sliced green onions