Preheat oven to 350 degrees F (175 degrees C). Grease and flour an 8 inch round cake pan.
In a large bowl, mix together the flour, sugar, cocoa, baking soda, and salt. Pour in the oil, vinegar, vanilla, and warm water. Beat until batter is smooth.
Pour batter into prepared pan. Bake for 30 to 40 minutes in the preheated oven, or until a toothpick inserted into the center of the cake comes out clean.
Let cool before serving.
Interesting Facts
This cake is also known as "Wacky Cake" and is one of the oldest chocolate cake recipes.
This cake has no eggs, making it a great vegan alternative.
This cake can be served with a variety of toppings, such as whipped cream, chocolate ganache, or a cream cheese frosting.