I love Costco's food sampling; it's everywhere around Costco. When I do come to the store on a hungry stomach, I get pretty full by the end of the shopping trip. It was that time, when I came across the a sampling that reminded me of the home made pierogi. They were absolutely delitious, but still did not beat the taste of the home made ones.
My family calls them vareniki with potatoes. My mother made those often when we had mashed potatoes left over. When I make them today, I like to serve them with fried bacon, or to stay more fit, sometimes I substitute bacaon with Canadian sour cream.