Prepare the base: Add chicken breasts, cream of chicken soup, cream cheese, chicken broth, garlic powder, onion powder, and Italian seasoning to your CrockPot. Stir slightly to combine.
Cook: Cover and cook on low for 4 hours (or high for 2).
Shred the chicken: Once cooked, shred the chicken directly in the slow cooker using two forks.
Add tortellini and spinach: Stir in the frozen tortellini and spinach, then top with mozzarella.
Cook again: Cover and cook for another 20–30 minutes on low, or until the tortellini are tender and the sauce is creamy.
Serve hot: Garnish with a sprinkle of parmesan or fresh parsley if desired.