- Place diced vegetables on a large sheet pan  lined  with foil and sprayed with non-stick spray. 
- Cook at 500 degrees for 40 minutes or until browned. 
- Add cooked vegetables to a large pot.  Add remaining ingredients and simmer for 30 minutes.  Puree using an immersion blender.  Add additional liquid if you desire a thinner soup. 
- Pour into individual serving bowls or cups.  Add a small amount of half and half to each serving, if desired. 
- Serve warm. 
- Note: if you use a blender or food processor to puree, do it in small batches.