Carefully cut each brownie layer horizontally in half, using long serrated knife, to make 4 layers. On serving plate, place 1 brownie layer, cut side down. Spread 1/3 of the mousse (3/4 cup) evenly to edge of brownie. Repeat layering twice, using 2 brownie layers (place cut sides down) and remaining mousse. Top with remaining brownie layer, cut side down. Refrigerate torte while making glaze.