Add in the onion and celery and cook for about 8-10 minutes or until the onion is translucent and lightly browned around the edges. Be sure to stir occasionally to prevent it from sticking.
Add the garlic and cook for 1 minute stirring to prevent burning.
While this is cooking combine the milk and cream in a bowl.
Sprinkle in the flour and whisk to combine.
Cook for 1-2 minutes whisking constantly to prevent lumps and to cook the flour.
Slowly whisk in the milk/cream mixture and simmer until thickened, about 6-10 minutes.
Whisk in the chicken broth and simmer until thickened again, about 6-8 minutes.
Add the carrots, spinach, nutmeg, thyme, parsley, 1 teaspoon salt, 1 teaspoon pepper, chicken, and gnocchi and stir to combine.
Cook for 10 minutes or until the gnocchi is softened and the spinach is wilted.
Taste and adjust to add the remaining salt and pepper if needed.
Notes
You can use 4 cups Half and Half in place of the milk and cream