1. Melt 2 tablespoons butter in a large soup pot oven over medium heat. Add onion to pan; cook 4 minutes or until tender, stirring occasionally. Stir in cinnamon and nutmeg; cook 1 minute, stirring constantly. Move onion mixture to side of pan; add remaining 4 tablespoons butter to open space in pan. Increase heat to medium-high; cook 1 minute or until butter begins to brown. Add sweet potatoes, water, broth, ginger, parsnips, and carrots; bring to a boil. Cover, reduce heat, and simmer 35 minutes or until vegetables are tender.
2. If you have a stick blender, blend away. If not go to step 2a.
2a. Place 1/4 of soup mixture in a blender. Remove center piece of blender lid (to allow steam to escape); secure blender lid on blender. Place a clean towel over opening in blender lid (to avoid splatters). Blend until smooth. Pour into a large bowl. Repeat procedure with remaining soup mixture.
Stir in cream or half-and-half, salt, and pepper. Ladle about 1 cup soup into each of 16 bowls; top each serving with about 2 teaspoons sour cream and 3/4 teaspoon parsley.
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