- Preheat the oven to 350°F and line an 8x8-inch square cake pan (or 9-inch round pan - see notes) with parchment paper so that the parchment stick up over the edge of the pan by a couple of inches for easy removal after baking. 
- Whisk together the 1½ cups all-purpose flour, 1 cup granulated sugar, 1 teaspoon baking soda, and ½ teaspoon salt in a mixing bowl. 
- Create three wells in the flour mixture and add the ⅓ cup vegetable oil or canola oil to one well, 2 teaspoons vanilla extract to another, and 1 teaspoon white vinegar to another. 
- Pour the 1 cup water all over the top of the mixture and then whisk together. 
- Pour the batter into the prepared baking pan and bake for 22 to 26 minutes or until a cake tester comes clean from the center of the cake. 
- Let the cake cool in the pan for 10 minutes before removing it by lifting the parchment paper and transferring it to a wire rack. 
- Once cooled, frosting with desired frosting or serve plain with a dusting of powdered sugar, whipped cream, and berries.