Grease two 8-inch pans (preferable springform pans, see above) and line the bottoms with parchment paper to allow for easy removal. Bake at temperature on box, reducing baking time to about 20 minutes (You can also bake 1 big brownie – which would cook for the normal time – and cut it in half, but cutting a brownie in half isn’t super easy).
Assembling it all:
Line the sides of an 8-inch springform pan with parchment paper. The parchment paper should stick up above the top edge of the pan, since the cake will probably be a little taller than your pan. If you want, put a cardboard cake circle in the bottom of the pan.