Hi Renee! You're certainly welcome to give it a try but we don't know how well the brownies will bake up. We imagine that the batter would have to defrost so it baked through evenly but we worry that it will separate in the process. We think it might be better to bake the brownies and freeze them, then your daughter can take a few out of the freezer and rewarm them. Best of luck and happy experimenting! 

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