Over the years there has been speculation to what is sprinkled on top of the McRib bun. I was once told by Mayor McCheese that the topping was not cornmeal when he was asked. Turns out in 2013 the McDonalds in Malaysia let the cat out of the bag in their promotion of the Chicken McRib:

The topping, in Malaysia at least, is in fact cornmeal! Perhaps not a huge surprise, however one that is a little surprising to have effort in masking. What do you think, would it be the same without the cornmeal topping?