Place the chicken breasts into the base of the slow cooker and sprinkle with garlic powder, salt and pepper.
In a mixing bowl, combine the Parmesan cheese, mozzarella cheese, well drained spinach, cream cheese and chopped artichoke hearts.
Place the spinach artichoke mixture on top of the chicken. Set the slow cooker on low and cook for 6 hours. (If your slow cooker runs hot, you might want to add 1/2 cup of water around the chicken.)
Once the chicken is cooked, remove it and slice it up and the add the spinach artichoke dip over the sliced chicken.
Prepare veggies or salad.
Serve Spinach Artichoke Chicken with veggies or salad.