As its name suggests, this sandwich is only available for a limited amount of time each day, if at all. If you're able to get to McDonald's between the breakfast and lunch times (about 10:30am to 11am), you may be in luck. To make one of these sandwiches, order an Egg McMuffin and a McDouble. Then, put the beef patties inside the McMuffin yourself, and enjoy a fast-food brunch.