These are golden squares of bean curd that have been deep-fried. You'll find them in cellophane bags in the refrigeration section of Asian markets, sold under a variety of names, such as Bean Kow or Bean Curd Puffs or Tofu Puffs. Deep-frying makes them very chewy.
The beauty of deep-fried bean curd is that it becomes super absorbent. That's why tofu puffs are popular in stews (it's best to briefly blanch them before using to remove excess oil). However, I confess I have an addiction to eating them right out of the bag. Other people indulge in slices of cheese or a carton of ice cream during their midnight raids at the refrigerator - I devour tofu puffs. At least it's healthier!