I've made these gourmet cheesy poofs using an Ina Garten recipe several times... gruyere cheese plus pate a choux dough (the same light and puffy dough used for cream puffs, eclairs, etc.). Seems intimidating, but is actually pretty simple. Definitely fun and fancy enough for a cocktail party or dinner party appetizer. We served it on Christmas Eve. Yum. Next time I'll try some different cheeses... blue cheese or cheddar, perhaps?