Pat salmon dry and season both sides with salt, pepper, and italian seasoning.
Heat olive oil in a large skillet over medium-high heat. Sear salmon skin side down for 4 minutes, flip, and cook another 3 minutes until just cooked through. Transfer to a plate.
Lower heat to medium and add butter to the same skillet. Add garlic and sun-dried tomatoes and saute 1 minute until fragrant.
Pour in chicken broth and heavy cream, scraping up any browned bits. Simmer 3-4 minutes until slightly thickened.
Whisk in parmesan and red pepper flakes until smooth. Add spinach and stir until just wilted, about 1 minute.
Nestle the salmon fillets back into the sauce and spoon sauce over the top. Simmer gently 2 minutes to warm through, then serve.