01 - Place chicken thighs in bottom of slow cooker in single layer.
02 - Whisk together pesto, ranch seasoning, chicken broth, heavy cream, and Parmesan cheese until smooth.
03 - Pour sauce mixture evenly over chicken thighs.
04 - Cover and cook on LOW for 4-6 hours until chicken reaches internal temperature of 165°F.
05 - Transfer chicken to platter, spoon sauce over top, and garnish with basil and Parmesan.