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.
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