Preheat oven to 350 degrees. Grease a 9 in round cake pan.

In a large bowl, add the flour, sugar, cocoa powder, baking soda and salt. Stir with a whisk to combine. Add the oil, vanilla extract, white vinegar and water. Stir with the whisk until fully combined and smooth.

Pour the batter into the prepared cake pan. Bake for 45 minutes or until a toothpick inserted in the middle comes out clean.

Remove from oven and allow to cool. Remove the cake from the pan and place on a serving plate. Sprinkle powdered sugar and cocoa powder over the top of the cake.

Enjoy!