Place the chicken thighs in the bottom of the slow cooker.
Add the chopped root vegetables around the chicken.
Drizzle olive oil over the chicken and vegetables.
Sprinkle dried thyme, rosemary, salt, and freshly ground black pepper over the ingredients.
Add minced garlic and lemon zest to the slow cooker.
Pour chicken broth over the ingredients, ensuring they are well coated.
Cover the slow cooker and set it to cook on low for 6-8 hours.
Once cooked, check that the chicken’s internal temperature reaches 165°F (75°C) and ensure the vegetables are tender when pierced with a fork.
Serve hot, garnished with extra fresh lemon zest or a sprig of rosemary for a fragrant finish.