Brezn go well with Weißwurst and sweet mustard early in the day or together with Obazda, onions and radish as a brotzeit snack in the afternoon or evening, both together with a Weißbier. Other than that Brezn are more of a to-go-pastry, often as butterbreze.
And although brezn are available everywhere in germany, there are regional differences in how they are made and they are more popular in the south.