What is basic white sauce in french?

The most common translation for "basic white sauce" in French is sauce blanche, literally meaning "white sauce".

However, depending on the context, you might also use:

* Sauce béchamel: This is the classic white sauce made with butter, flour, and milk.

* Sauce velouté: This is another common white sauce made with a roux (butter and flour) and a stock.

It's important to consider the specific type of white sauce you're referring to when choosing the best translation.