You can also make a really quick bechamel sauce and that'll get the job done as a thinking agent

The real answer is a can of evaporated milk (not sweetened, obviously). It won’t burn or curdle and helps other dairy not separate.
You will need salt and other seasoning to taste.

Anonymous wrote:Sour cream and a bunch of salt would be about the same thing as well

This or even greek yogurt. delicious. Try celery salt and garlic salt.