Stan's has the best Kolaczki and Paczki (this is the correct spelling, people) in the area, at least on the east side. All the Slavic Village shops closed down which is rather sad.
You have to drive 1/2 hour out to Northfield to get them but it could be worse. Small little place thats been at this corner since 1961. In July of 1961, Stan's Northfield Bakery was established by Stanley, Helen, and their son David. Everything is made from scratch.
They feature at least a dozen varieties of Paczki and they are frequently featured in area Best off lists. The apple, apricot and raspberry are exceptional. They cost about 1.50 each.
Quick note on how to heat pieorgi: They are sold in a package of about a dozen. Heat a pan of boiling water but not a rapid boil. Place the pierogi in the boiling water briefly until they float to the top. Remove immediately with a slotted spoon. Bathe in melted butter and plate. Do not pan fry them, do not deep fry them.