If someone is eating bread less than a shuir for benching can the shuir be joined with other mezonot like cookies, cake, crackers or oatmeal so that one can bench and also be able to wash with a bracha?
Answer:
If one wishes to join cakes and crackers for the purpose of benching and washing with a berachah, one would have to ensure that one eats enough to actually become full, or at least the regular amount that people would generally eat for a meal.
It will not be sufficient to eat half a zayis of bread, and join it with half a zayis of cracker, because one cannot bench unless one eats a full kezayis of bread -- unlike one is kove'a se'udah on crackers and cake.