This comforting and classic recipe for crockpot chicken noodle soup is perfect for a sick day. Start by processing onions, garlic, carrots, and celery in a food processor until finely chopped. Then, add the mixture to a crockpot along with chicken breasts, chicken broth, and noodles. Cook on low for 6-8 hours, or until the chicken is cooked through and the noodles are tender. Serve hot with a side of crackers.