Add first 8 ingredients to slow cooker
Cook on high 6 hours or low 8-10 hours.
Remove 1/3 of soup(do this in two batches). Blend in blender with cream cheese, 1/2 of cream cheese in each batch. Return to pot when blended smooth. If you have an immersion blender this could be used. If using an immersion blender, add cream cheese directly to slow cooker. Blend with the immersion blender until about 1/3 of soup is blended smooth and cream cheese in incorporated.
Slowly stir in shredded cheddar cheese.
Taste and add salt and pepper if needed.
Garnish with green onions, bacon, sour cream, and extra cheddar cheese if desired.
One could add 2 whole chicken breasts with the first 8 ingredients. If this is done, then remove chicken at blending process and dice or shred. Return diced or shredded chicken to soup.