When I lived in the US:

Domino sugar. The store brand was too often hard as a rock and needed to be broken up with an ice pick. Also Kellogg's corn flakes because the taste and texture was better than the no frills options. A couple more, but otherwise, there were a lot of store brand things that were quite good. For example, the Shoprite store brand chocolate hazelnut spread (imported from Italy) was yummier than US-based Nutella (made in New Jersey for US distribution). The Nutella available in Czech Republic is made in Poland or Czech Republic. Other brands available of this product in CZ are made in places like Sweden, nowadays. Not from its original source in Italy.

What is/are your favorite Christmas cookie(s) or cookie in general?