Lightly spray or oil a large bowl and measure 8 cups of puffed wheat into the bowl.
Combine in a saucepan:
1/4 cup butter
1/2 cup corn syrup
1 cup brown sugar
1/4 cup cocoa
Cook until bubbling and smooth, then remove from the heat and add 1 tsp vanilla. Pour over puffed wheat.and stir to coat evenly. Press into an ungreased 9 x 13-inch pan. Cut into squares when cool.
For a variation, use 7 cups puffed wheat and 1 cup salted peanuts