1. Arrange Chicken: Place the chicken thighs in the bottom of your slow cooker. Mix the chicken stock, lemon juice, and lemon zest, then pour this mixture over the chicken.

2. Add Seasoning: In a small bowl, blend the garlic powder, onion powder, paprika, crushed red chili pepper flakes, Italian seasoning, salt, and pepper. Sprinkle this seasoning mix evenly over the chicken. Top with the minced garlic and diced butter.

3. Cook: Cover the slow cooker and set it to cook on HIGH for 3-4 hours or on LOW for 6-8 hours, until the chicken is tender and infused with the flavors.

4. Finish and Serve: Once cooked, garnish the chicken with freshly chopped parsley and lemon slices. Serve your lemon garlic butter chicken hot with a side of cauliflower rice, zucchini noodles, rice, pasta, or quinoa.

This Slow Cooker Lemon Garlic Butter Chicken is an effortless yet mouthwatering dish. The slow cooking allows the chicken to absorb the vibrant flavors of lemon, garlic, and butter, making it a perfect meal for any night of the week.