Quick to make, easy to eat! Rich chocolate sheet cake.
Assemble the ingredients before starting.
If you don't have buttermilk on hand, mix 1 1/2 teaspoons vinegar with 1/2 cup milk. Let sit a few minutes. Voila, buttermilk!
Preheat oven before mixing cake batter.
Use a greased and floured 10 X 15" jelly roll pan or line with parchment paper.
Make frosting immediately after cake is out of the oven, then frost.