Add the chicken breasts to your crockpot. Add the chopped carrots, celery, and onion.
Sprinkle the parsley, garlic, thyme, salt, and pepper over the top. Pour in the chicken broth.
Cook on high for 3–4 hours or on low for 6–8 hours.
About one hour before the cooking time is done: Whisk together the heavy cream and cornstarch until smooth.
Stir it into the crockpot and add the gnocchi.
Right before serving: Stir in the chopped spinach and grated parmesan cheese.
Let it cook for about 5 minutes, just until the cheese melts and the spinach softens.
Give everything a gentle stir, and it’s ready to serve.