Freshly grated Parmesan or sour creamfor garnish, optional
Instructions
Combine all ingredients in a slow cooker. Cover and cook on low for 5-7 hours, until flavors are blended and vegetables are soft.
Allow the soup to cool slightly. Then puree in batches in a blender until very smooth. Serve immediately, or transfer the soup back to the slow cooker and keep on low until your guests arrive.
Garnish with more fresh basil and some grated Parmesan cheese or even sour cream