The sandwich features a breaded and fried chicken patty, a freshly-cracked egg, a slice of American cheese, and special sauce (looks like mayo) on a toasted English muffin. It's also available without the egg, but then it's just the chicken isn't it?
Being a mostly Muslim country, the Chicken Muffin makes a lot of sense for Malaysia since the consumption of pork is forbidden in Islam. They do have sausage on the breakfast menu, but it's chicken sausage. Biscuits aren't in the menu mix like they are in the U.S. But, don't worry... they have hash browns!