Melt 4 tbsp butter in a large soup pot over medium-high heat. Add in the gnocchi and toast on all sides, stirring often (about 5 minutes), until lightly golden brown. Use a slotted spoon to remove the gnocchi to a plate and set aside.
To the same pot (over medium-high), add in the diced onion, celery and carrots and sauté until the veggies are tender (about 5 minutes). Stir in the garlic, Italian seasonings, and and pepper, and cook until fragrant (about 30 seconds). Sprinkle in the flour and cook for an additional minute, stirring thoroughly.
Gradually stir in the chicken broth to the vegetable mixture, making sure to smooth out any clumps of flour that might occur. Bring the mixture to a boil and simmer, until the veggies are tender to your liking.
Stir in the gnocchi, heavy cream and rotisserie chicken and heat through. Once heated through add in the spinach and stir until the spinach breaks down and wilts into the soup. Season with more salt and pepper to taste if desired. Garnish with parmesan cheese when serving. Enjoy!
Notes
Store leftovers in the fridge for up to 5 days or in the freezer for up 3 months.