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.

McDonald's absolutely struck gold when announcing the now irreplaceable apple pie in 1968. Over the past five decades, there have been over 40 pie flavors that have graced the chain's menus around ...

Beyond that, McDonald's doesn't rely on thickeners like cornstarch or all-purpose flour like some pie producers do, but instead on dehydrated apple powder. This means that every bite has extra ...