Mix the Brie and cornstarch together in a bowl. Bring the wine, mustard, and shallots to a boil in a sauce pan. Allow it to boil for about 5 minutes.
Reduce the heat to medium high and slowly stir in the cheese and crab. Stir for about 5 minutes, until the flavors develop and the alcohol cooks away.
Taste and adjust the seasonings.
OK to prepare up to 2 days in advance and refrigerate, or freeze for up to 3 months.
OK to use as a sauce over broccoli, asparagus, chicken breasts, or fish. Season with either 1/2 teaspoons dried crushed Tarragon or 2-4 minced green chilies. Serve with Chardonnay.