Baked Potato Soup - Diet Recipe

Ingredients

• 4 medium (4 oz) baking potatoes
• 5 cups skim milk
• 1/2 cup all-purpose flour
• 1 bunch green onions, sliced
• 1/4 cup shredded sharp cheddar cheese
• 4 Tbsp grated parmesan cheese
• 1/2 tsp black pepper
• 1/2 cup fat-free sour cream