Sift dry ingredients together directly into a 9 x 13-inch ungreased baking pan.
Let your child make three wells in the dry ingredients. Pour the oil into one well, vinegar into the second well, and vanilla into the third well. Pour cold water over everything and stir well with a fork.
Bake at 350 degrees for 30 to 40 minutes, or until a toothpick inserted comes out clean.