Rich, chocolatey, and moist even without milk, butter, and eggs! This timeless crazy cake originated in a time of scarcity, but is still the perfect way to indulge in a sweet treat!
Preheat and prepare: Preheat oven to 350°F. Grease a 9x9" square pan with butter. See notes for a 9x13" pan.
Add dry ingredients to pan: Directly into the greased pan, add 1 1/2 cups flour, 1 cup sugar, 1/3 cup cocoa powder, 1 teaspoon baking soda and 3/4 teaspoon salt. Whisk gently.
Add wet ingredients to pan: Make a hole in the dry ingredients and add 1 teaspoon vinegar, 1 teaspoon vanilla, and 1/3 cup oil. Pour 1 cup of warm water over the top and whisk to combine the batter well.
Bake cake: Bake cake for 33-35 minutes. Cool completely.
Make frosting: While cake is cooling, add 1/4 cup butter, 1/4 cup cocoa powder, 1 teaspoon vanilla, 1 cup powdered sugar, 2-3 Tablespoons cream, and a pinch of salt to a medium sized mixing bowl. Mix with a hand mixer until smooth and fluffy.
Frost cake: Frost cake and serve!
Notes
For a thinner cake, you can use a 9x13" pan. Check for doneness at 30 minutes. And double the frosting!