Introducing the Triple Breakfast Stack
                                
                                
                                    (Newser) -
                                    Because sometimes, a single layer of sausage, meat, and cheese is just not enough: McDonald's is adding a new breakfast item to its menu, the  Triple Breakfast Stack . The sandwiches are basically oversize versions of the fast-food chain's pre-existing McMuffin, McGriddle, and biscuit products, except these have two...