Preheat oven to 325 degrees F. Pour prepared brownie batter into a round spring form pan. Bake according to package directions. Make sure center is cooked and not gooey. Cool completely!Do NOT remove the brownie from the pan.
Allow ice cream to sit out for about 5 minutes. Give ice cream a quick stir to break up the middle and then spread over the top of your brownie base in the spring form pan. Return to freezer immediately and allow to harden up for at least an hour.
With the brownie and ice cream still in the pan, pour the chocolate sauce over the top and spread to cover. Return the whole thing to the freezer for at least 30 minutes.
Just before serving top with the maraschino cherries around the outside and in the middle. Then remove the cake from the spring form pan*. Slice and serve.
*The easiest way to do this is to place the pan on a tall object like a jar and allow the outside part of the pan to fall away from the base.