In a large saute pan, melt the butter and cook onions on medium-low heat for 12 to 15 minutes, until the onions are lightly browned.
Whisk the flour into the pan.
Add salt and pepper.
Cook for 2 to 3 minutes.
Add the chicken stock/drippings, wine and Brandy/cognac
Cook uncovered 5 minutes, until thick.
Add the cream and serve!