Mix flour, sugar, cocoa, salt, and baking soda. In a separate bowl, mix vanilla, vinegar, oil, and water. Add oil and water mixture to the dry ingredient mixture and combine well. Pour batter into an 8-x-8-inch greased baking dish. Bake at 350 degrees for approx. 30–35 minutes.
Recipe courtesy of Karen Simonis, Black River Falls, WI.