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Preheat the oven to 350° Fahrenheit. Grease or line an 8x8-inch baking pan.
Mix flour, sugar, cocoa powder, baking soda, and salt in a large bowl.
Make 3 wells in the dry ingredients. Pour oil into one, vinegar into another, and vanilla into the third. Pour the water over everything and stir until smooth.
Transfer the batter into the pan. Bake for 30–35 minutes at 350° Fahrenheit, or until a toothpick inserted in the center comes out clean. Let cool completely before icing.
Chocolate Icing
Whisk the powdered sugar, cocoa powder, and salt in a bowl.
Add oil, vanilla, and 2 tablespoons of hot water. Mix until smooth.
Pour the icing over the cake and serve.
Notes
Chill Time varies (about 1 to 2 hours) and not included in the total time.