Brown the Sausage: Heat olive oil in a large skillet over medium-high heat. Add Italian sausage and cook for 5-6 minutes, breaking it into crumbles, until browned.
Cook Mushrooms: Add sliced mushrooms to the pan and cook for 3-4 minutes until softened.
Add Aromatics: Stir in minced garlic, Italian seasoning, Herbs from Provence, and red pepper flakes. Cook for 1 minute until fragrant.
Build Sauce: Pour in tomato sauce, chicken broth, and water. Stir well and bring to a simmer.
Cook Gnocchi: Add gnocchi to the pan and stir to coat. Cover with a lid and cook for 8-10 minutes, stirring occasionally, until gnocchi is tender.
Add Greens: Stir in fresh spinach and cook for 1-2 minutes until wilted. Season with salt, black pepper, and thyme.
Serve: Remove from heat, let rest for 1-2 minutes, and serve warm with optional toppings.