Spray 6-quart saucepot with nonstick cooking spray. Pat dry chicken breasts, cut into 1-inch pieces, and sprinkle with salt. Heat pot on medium-high; add chicken to pot. Cook 3 to 4 minutes or until browned all over, turning. Add pumpkin, tomatoes, peanut butter, water, and ground coriander. Break up tomatoes with spoon. Heat to boiling on high. Reduce heat to medium; simmer 5 minutes or until chicken is no longer pink in center.