Not a Recipe

A hundred years ago when I had lots of company and had to carry food around - I used to do this....
Just make a recipe for a small (8" or 9" pan) batch or mix of brownies and add lots and lots of nuts but bake it in a 9 x 13" pan. Watch them carefully so the thin brownies don't burn. When its done slice into 3 large, equal slices.

Soften a half gallon of good vanilla ice cream so you can cut that into thick slices. Put the first brownie slice on a serving platter and top it with a slice of ice cream. Top that with another slice of brownie, then more ice cream then the last slice of brownie. Put the whole thing in the freezer so the ice cream gets solid again.

Start whipping some cream, add some sugar and a big spoon of baking cocoa so you get chocolate whipped cream. Use that to frost the brownies and ice cream. Let it soften a bit before serving.