K.W.
You could combine snack time with craft time and do gingerbread houses! Before class, glue graham crackers to boxes (little milk cartons from schools work great). Then help the kids cover the graham crackers with frosting and stick marshmallows, m&ms, reese's pieces,pretzels, raisins, etc. into the frosting. They can even use sugar sprinkles to put on top. Yes, they'll get messy and yes, they'll eat more than what goes on their house, but they'll have fun and have a cool little craft to take home. Just warn parents ahead of time to send them some play clothes so they don't get frosting on their church clothes. I used to work in a preschool and the kids always loved this--you can even get parents to come in and help out.