Place the chicken breasts, chicken broth, garlic, Italian seasoning, salt, and pepper into the crockpot.
Cover and cook on low for 4 hours or until the chicken is tender.
Shred the chicken directly in the crockpot using two forks.
Pour in the heavy cream and stir to combine.
Add the tortellini, cover again, and cook for 30 minutes until pasta is tender.
Stir in spinach and Parmesan cheese just before serving.
Serve warm with extra Parmesan if you like it cheesy.