Also known as wacky or depression cake, crazy cake is moist, rich, chocolatey and surprisingly not too sweet. The top has a glossy, tackiness that makes it finger-licking good.
Heat oven to 350° Fahrenheit. Grab a 9x13-inch pan. Do NOT grease.
Put the flour, baking soda, salt, unsweetened cocoa and sugar in the pan and whisk them around with a fork to combine. Make three separate wells in the dry ingredients - a large one and two small ones.
In the large well, pour vegetable oil. In the second well, pour in vinegar. In the last well, pour in vanilla.
Pour the 2 cups cold water over all of it and mix with a fork.
Bake 35-40 minutes or until a cake tester or toothpick comes out clean. Cool to room temperature. Sprinkle with powdered sugar before serving. Serve with berries if desired. Store in airtight container.