01 - Arrange the chicken thighs in a single layer at the bottom of the slow cooker insert.
02 - In a medium bowl, whisk together the pesto, ranch seasoning, chicken broth, heavy cream, and Parmesan cheese until thoroughly combined and smooth.
03 - Pour the sauce mixture evenly over the chicken thighs, ensuring each piece is covered.
04 - Cover and cook on LOW setting for 4-6 hours, or until the chicken reaches an internal temperature of 165°F and is tender throughout.
05 - For a crisped exterior, transfer the cooked chicken to a baking sheet and broil for 2-3 minutes until lightly browned.
06 - Plate the chicken and spoon the remaining sauce generously over the top. Garnish with chopped fresh basil and additional grated Parmesan.