Add the oil, vinegar and vanilla and stir. Mixture will be lumpy.
Pour in the hot water and stir until the lumps are gone.
Pour into a greased and floured 9x13" pan or two round cake pans.
Bake at 350 degrees for 30-40 minutes. When a toothpick inserted into the middle comes out clean or with a few crumbs, the cake is done. You may need start checking round cakes at 25 minutes.
Top with frosting or powdered sugar if desired.
Recipe Notes
For a healthier take on this recipe, you could substitute half whole wheat flour, use only 2/3 cup sugar, and substitute two mashed bananas and 1/4 cup coconut oil for the vegetable oil.