Heat olive oil and butter in a large pot over medium heat.
Add diced chicken and cook until browned and internal temperature reaches 165°F (74°C), then remove chicken and set aside.
In the same pot, sauté onion, carrots, and celery for 5 minutes until softened.
Add minced garlic and cook for 1 minute until fragrant.
Pour in chicken broth, thyme, salt, and pepper, then bring to a light simmer.
Add gnocchi to the pot and cook for 3 to 4 minutes or until they float to the surface.
Reduce heat to low and stir in the cooked chicken and heavy cream.
Add baby spinach and stir until leaves are wilted.
Serve immediately.