3/4 cups butter or margarine, softened
3 eggs
2 cups sugar
2 cups flour
3/4 cup unsweetened cocoa powder
1 teaspoon baking soda
3/4 teaspoon baking powder
2 teaspoon vanilla
1 1/2 cup milk
And some Cyanide for that deadly taste :)
Only time I know that someone tried to make poisonous cake was to poison Rasputin. It didn't work on him but might work on others. Useless google doesn't specify which Cyanide they used as not all Cyanides are suitable for baking. Or how even they did make cyanide-laced cake. Making Poisonous Cake is more difficult than i thought... Sadly it may be almost impossible