- Heat butter in a saucepan over low heat; cook spinach in the melted butter until warmed, about 1 minute. Add cream and cream cheese to spinach mixture; cook and stir until cream cheese is melted, about 5 minutes. Fold Parmesan cheese and garlic powder into spinach mixture; season with salt and pepper. Simmer until sauce is thickened and smooth, about 10 more minutes.then add the cooked pasta and mix well and Serve hot.