The school gym is filled with the sweet smell of cupcakes and cookies, and the Breakfast Bunch could not be more excited. The annual bake sale is finally here, and all the money raised will go toward an amazing class field trip. But disaster strikes when the delicious treats suddenly start disappearing. Someone is sneaking around the school and stealing the snacks, completely sabotaging the bake sale. If the missing goodies are not found soon, the big field trip will have to be canceled. It is a mystery that requires a true hero, and the school's secret crime-fighting Lunch Lady is ready to take the case. Armed with her incredible kitchen gadgets and her sharp investigative skills, she teams up with the Breakfast Bunch to track down the thief. Together, they will follow the trail of brownie crumbs to uncover the truth and save the day.