Hi - I bought a bag of frozen chicken potstickers - tried 2 and they were tasteless and mostly dough 0 can I return for a refund?

Absolutely

Anything you buy from COSTCO can be returned, no questions asked. They will always take it back, as long as it was purchased from COSTCO, it is returnable....

Yeah. Any food that is rotten or contaminated, take it back immediately for your safety

I think you can return it if it is spoiled or bad and this is whatever the food is