Store brownies in an airtight container at room temperature for up to 3 days. To freeze, line the baking pan with foil, extending foil over the edges of the pan, and grease the foil. Bake the brownies in the foil-lined pan as directed, and cool completely. Using the edges of the foil, lift the uncut brownies out of the pan, place them in a freezer container or bag, and freeze up to 1 month. Before serving, thaw for 1 hour. Cut and serve as directed.