Spray 3 1/2- to 4-quart slow cooker with cooking spray. In cooker, mix all soup ingredients except half-and-half.
Cover; cook on Low heat setting 7 to 9 hours.
Strain cooked vegetables from cooking liquid, reserving liquid. In blender or food processor, cover and blend vegetables until smooth. Return vegetable puree to cooker. Stir in 1 1/2 cups of the reserved liquid and the half-and-half. Cover; cook on Low heat setting about 10 minutes longer or until warm.
Garnish each serving with peanuts and cilantro.