It happens: A sudden visit to McDonald's results in an order that is an eyes-bigger-than-stomach moment. Now you are faced with an apple pie in a package ... million baked hot apple pies sold ...

Some corporate fast food secrets are fiercely protected, but it's no mystery why McDonald's apple pie tastes the way it does. Here's what to know.

To find which fast-food chain serves the best apple pie, I tried pies from Arby's, McDonald's, Panda Express ... topped with cinnamon sugar. It came hot and crispy straight out of the fryer ...

Of the many iconic McDonald's menu items, there are a few that are so flavorful that customers ... flakey and irresistible apple pie, it turns out that the real mystery is just how much of that ...