Season poultry evenly with salt, pepper, and Italian seasoning.
Heat olive oil and butter in a large skillet over medium-high heat. Sear the meat for 5-7 minutes per side until golden and cooked through. Remove and set aside.
In the same skillet, saute garlic and sun-dried tomatoes for 1 minute until fragrant.
Lower heat to medium. Stir in heavy cream and simmer for 2 minutes to thicken slightly.
Whisk in grated parmesan cheese until smooth, then add spinach and stir until wilted.
Return the seared fillets to the skillet, coat with the sauce, and simmer for 2 more minutes before serving warm.