The suggestion above (Sunday School is like Buried Treasure/Sunday School is a Pearl Worth the Price!) for adapting a Writing Team cooking lesson into a Rally Day/Renewal activity is a yummy fun suggestion!
I would expand the idea to produce A BUNCH of storytelling cinnamon rolls and have the children distribute them to congregation members (pass them on trays) during a social hour or post-worship event for Rally Day or Welcome Back or whatever your church does to celebrate a new school year. Encourage the members to ask and the children to share what they heard and learned as part of the cooking process. It is a safe way to have the children practice going and being witnesses and a great way to foster intergenerational conversation in the congregation.