Just tried the Chicken Pesto purses and mini Quiche from Costco. Not bad at all. I can't say I detected much pesto flavor in the former, more like a knish. But these would fit the bill nicely to supplement a cocktail menu.
random, we tried the Chicken Pesto at Thanksgiving and have been buying the mini quiche for some time. We found the pesto tasty but the overall appetizer dry. The mini quiche has always been a favorite quick cook with salad during a busy work week.
Have you tried to frozen potstickers?