It has a couple of steps, but is still very easy to make. You'll need to take a trip to the store, however, unless you keep a can of evaporated milk on hand.
Below are the dry and wet ingredients. You start out making the sauce, in bowl at right.
While the sauce is cooking, prepare the main batter and pour (or spoon -- this is a thick batter) into the baking pan.
Next, pour the liquid sauce over the batter. You'll be sure at this point, that the recipe is not correct, but forge ahead. Place in the oven and wait for the magic.