Super easy to make brownie ice cream cake. Bake a pan of brownies using a 9 by 11 pan. (I substitute butter for oil for a more dense base). Buy a rectangular carton of ice cream and slice into one inch thick pieces. Place those directly on top of the brownie and top with cool whip. I like using vanilla and sprinkling with Heath bars or topping with with mint chocolate chip. You can decorate with chocolate syrup.