In a bid to maintain the hype -- and the sales gains -- the chain is planning to add McGriddles and more breakfast sandwiches to its all-hours menu.

With breakfast-peddling competitors like Burger King, Taco Bell and Dunkin' Donuts nipping at its heels, McDonald's had to remove the hitch from its giddy-up to get millions of pounds of butter to its 14,000 U.S. restaurants.