Uses for White Button Mushrooms Probably the most popular of all mushrooms, white button mushrooms, sometimes known by their French name of champignons are always available fresh. However, there are those times when you've either forgotten to purchase them or have found the fresh ones you purchased last week are no longer useable. This is where the dried ones fit the bill for any recipe calling for white mushrooms. Keeping a supply on hand is always a good idea. You'll also find that dried button mushrooms have a much more intense flavor than the fresh ones. Reconstitute them in hot water, stock or wine and then add them to your favorite soup, sauce, stir-fries, stuffing, or pasta dishes and don't forget the risotto. You can also serve them as a side dish after sauting them in garlic, shallots, parsley and thyme. Store the dried mushrooms in a cool, dark place, in an airtight container or better yet refrigerate or freeze.