For an extra fun look to this cocktail, try rimming your flute with gold sugar before assembling it.
Champagne Cocktail you'll need 1 sugar cube, bitters, chilled cognac, and champagne... In your flute, place one sugar cube and drench it with Angostura bitters. Add 1 ounce chilled Cognac (this may be kept in a cold place like a cooler, or chilled per cocktail). Top with champagne.