While creamy garlic parmesan sauce is kind of similar to Alfredo sauce, it still has some big differences. Traditional Alfredo is only butter, pasta, and parmigiano-reggiano cheese. This garlic parmesan sauce is butter and parmesan, but we're also adding cream, garlic, spices, and chicken. It's closer to the pre-made Alfredo sauce you can buy at the supermarket, but still homemade. Traditional Alfredo sauce does not use cream, just butter.