Add butter to a skillet on medium-high heat. Swirl to melt. Add shrimp. Season with Italian seasoning and cook til pink. Remove shrimp and set aside.
Add 3 tbsp butter and garlic to skillet. Add diced tomatoes and seasoning with salt & pepper. Cook for 3 mins
Add a handful of baby spinach. Once spinach is wilted, add heavy whipping cream.
Add the Parmesan cheese and the basil. Turn the heat down to low and let it simmer. Stir for 3 minutes or til cheese is melted. Serve over noodles or by itself.