Preschoolers have special dietary needs, they often prefer small meals and need snacks to keep them going during the day.
Sites listed here will help you in finding ideas about what to feed your Preschooler.
From the National Network for Child Care. Healthy snack ideas, some "instant" and some which require some preparation. Also an article on young children and the need for snacks during the day. http://www.nncc.org/Nutrition/cc42_snacks.presc.html