Preheat oven to 350º. Grease an 8x8 pan (or double ingredients for a 13x9 pan).
Measure dry ingredients into the pan and stir together.
Make one large depression and 2 small depressions in the dry ingredients.
Into the large depression, measure the oil.
Measure vinegar into one small depression and vanilla into the other.
Pour coffee over everything and stir until no lumps remain.
Bake for 35 minutes until a toothpick inserted in the center of the cake comes out clean.
You can cool and then frost, or for a smoother look put the frosting on while it's hot. (I frosted it right out of the oven, because I wanted a melted frosting like on Texas Sheet Cake)