To make this crockpot chicken thighs recipe: Place chicken thighs at the bottom of your slow cooker. Combine 1/3 cup chicken broth, lemon juice, and zest, and pour over chicken thighs. In a small bowl, combine Italian seasoning, onion powder, garlic powder, paprika, crushed red chili pepper flakes, salt, and pepper. Sprinkle the spice mix over the chicken thighs. Top with fresh minced garlic and diced butter.