Plus the crockpot cooks the chicken breasts perfectly making the insides tender and moist. And if you like this recipe as much as I do, you might also enjoy this creamy Tuscan chicken pasta. Before serving this easy crockpot Tuscan chicken, stir in the spinach and allow it to wilt just briefly until it is completely covered with the sauce. You can adjust the amount of spinach based on your personal preference. If you need to use frozen chicken, first leave it to thaw in the refrigerator overnight. Then pat the breasts dry with a piece of kitchen paper to remove any excess moisture before cooking.