1Place vanilla wafers on bottom and along the sides of a large bowl or casserole dish.
2In a medium sized saucepan, mix together the sugar, corn starch, salt, milk and egg. BEFORE turning on the burner stir all ingredients together making sure corn starch has dissolved. Corn starch will NOT dissolve in hot liquid.
3Heat on medium - medium high heat stirring or whisking constantly until pudding has thickened. Remove from heat, add butter and vanilla.
4Slice bananas and spread over vanilla wafers.
Pour pudding over bananas.
5For garnish, crumble a few vanilla wafers and sprinkle over pudding.