Prepare store bought brownie mix according to package directions in an 8”x8” or 9”x9” square baking dish. Allow the brownies to cool and then remove from the baking tray.
Slice the brownies into 16 square pieces.
Transfer the vanilla icing into a piping bag with a plain small round tip, or a Ziploc bag with the corner cut off (make a very small cut).
Starting from the center of each brownie pipe a spiral around the brownie.
From the center of each brownie, use a toothpick to drag the icing to the edges of the brownie.
Transfer the brownies to a serving platter and enjoy!