This is a very rich dessert that makes a BIG dish full, so save it for a large gathering! As an alternative, you can layer the ingredients into small juice glasses and just store the things you don't use.
1 box brownie mix (plus any ingredients you need to make it)
1/4 C chocolate or coffee liqueur, if desired
1 large package fudge pudding mix (plus the milk to make it)
1 tub Cool Whip, not frozen
8 oz crushed toffee candy bars, like Heath
1 block baker's chocolate
Bake the brownies. While they are still warm, use a toothpick to poke holes at one-inch intervals around them. (This is to let the other ingredients soak in later.) If desired, "paint" the brownies with the liqueur using a basting brush. Let them cool completely. Then, break them into chunks.
Make the fudge pudding.
Layer the ingredients in a trifle dish like this:
Then, repeat the layers.
To top it off, use a vegetable peeler on the block of baker's chocolate to make chocolate curls. Drop them across the top of the dish for a pretty finish.