Prep: 1. Preheat oven to 350. Make: 1. In 8-inch cake pan, whisk together flour, sugar, cocoa, baking soda, and salt. 2. Make well in center of mixture. 3. In well, add oil, vanilla, vinegar, and 1 cup of cold water. Whisk until well combined. 4. Bake for 35-40 minutes, or until toothpick inserted in center comes out clean. 5. Cool completely in pan before dusting with powdered sugar and garnishing with berries.