In a bowl, whisk together the melted butter, olive oil, fresh lemon juice, lemon zest, minced garlic, dried oregano, dried thyme, smoked paprika, salt, and black pepper.
Place the chicken thighs in the slow cooker, skin side up. Pour the lemon garlic mixture evenly over the chicken.
Add the chicken broth to the bottom of the slow cooker around the chicken.
Cover and cook on low for 6 to 7 hours or on high for 3 to 4 hours, until the chicken is cooked through and very tender.
For crispy skin, transfer the chicken thighs to a baking sheet skin side up. Broil on high for 3 to 4 minutes until the skin is golden and crisp.
Spoon the lemony pan juices from the slow cooker over the chicken thighs. Garnish with fresh chopped parsley and serve with your favorite sides.