Place chicken in the bottom of the slow cooker.
Combine broth, lemon juice and zest. Pour over the chicken thighs.
in a small bowl, mix Italian seasoning, garlic powder, onion powder, paprika, cayenne, salt and pepper. Sprinkle the mix over the chicken thighs. Top with the fresh garlic and chopped butter.
Cover the slow cooker and cook for 3-4 hours on HIGH or 6-8 hours on LOW.
Garnish with parsley and serve with your favorite side dish, for example rice, cauliflower rice, zucchini noodles, pasta or potatoes.