Human: How do you make a good sour cream sauce for potatoes? Assistant: 
To make a good sour cream sauce for potatoes, start by heating up some butter in a pan. Once the butter is melted, add in a small amount of flour and stir to combine. Next, add in 1/2 cup of milk and whisk until it starts to thicken. Finally, add in 2 cups of sour cream and season with salt and pepper to taste. Whisk everything together until the sauce is smooth and creamy, then pour over your potatoes. Enjoy!