Peanut butter brownies from mix take classic brownies to the next level with rich chocolate and creamy peanut butter swirls ...

They can remain out at room temperature while you are serving them, but these brownies should be stored in the fridge.

Completely cool brownies on rack, at least three hours. 14. Cut into squares and serve. If not serving immediately, do not cut brownies. Whole brownie cake can be wrapped in plastic wrap then foil, ...