Line a 9x13-baking pan with non-stick aluminum foil (or aluminum foil sprayed with non-stick spray.) Spray a 5-inch metal oval cookie cutter with non-stick spray and set it in the center of the pan. Pour chocolate pound cake batter into the pan, leaving the center oval empty. Bake for 28-32 minutes, until a toothpick inserted into the cake comes out clean. Cool for 10 minutes, then carefully remove the oval cookie cutter. Allow cake to cool completely, then peel off tin foil and level the cake, by removing the domed top.