Create Base: Stir in flour until well blended, then gradually whisk in chicken broth. Bring to a boil and simmer uncovered for 4-5 minutes until slightly thickened.
Add Gnocchi and Chicken: Stir in gnocchi and cubed chicken. Cook for 4-6 minutes, until gnocchi is tender and heated through.
Finish with Cream and Spinach: Reduce heat to medium-low, stir in spinach, heavy cream, thyme, salt, and pepper. Heat until spinach wilts and soup is warmed.