I'm posting this so maybe I can remember. Wayne likes sour cream in his Alfredo sauce. I don't particularly, which is maybe why it's difficult for me to remember. He likes the tang, though, so I need to remember that. Anyway, here's the recipe we used this week (from Our Best Bites). Next time I need to try adding sour cream to it and see how it works.
Combine 2 cups milk, 3 ounces cream cheese, 3 tablespoons flour and 1 teaspoon salt in the blender and combine well. Sauté 3 garlic cloves, minced, in 1 tablespoon butter in a small saucepan for just a couple of minutes. Stir in the milk mixture and bring to a boil. Reduce and simmer for a couple of minutes. Stir in 1 cup grated Parmesan cheese. Let sit for 10 minutes before stirring.