Mix dry ingredients in 9 x 9-inch pan. Make 3 holes. Pour oil in one hole, vinegar in another hole and vanilla in last hole. Pour water over top of all. Mix well with fork or hand mixer. Do not beat. Bake at 350 degrees for 30 minutes. After cake has cooled, if desired, you can dust with powdered sugar or iced with your favorite frosting.
Cut into 2-1/4″ squares.
This makes a single layer cake.