Ham and Potato Soup

Bahan-bahan (8 porsi)

• 1 medium onion (diced)
• 3 tablespoons butter
• 4 cups diced potatoes (about 3 large potatoes)
• 3 cups chicken broth
• 2 cups diced ham
• 1 large carrot (chopped)
• 1 rib celery (sliced)
• 2 cloves garlic (minced)
• 2 teaspoons chopped fresh parsley
• ½ teaspoon dried thyme leaves
• black pepper (to taste)
• 1 cup half and half
• ½ cup sour cream
• salt and black pepper (to taste)
• 1 tablespoon cornstarch