Dunkin' Donuts was apparently so popular that they've made it a permanent menu item.
The sandwich was introduced earlier this year and features a fried egg, turkey sausage, and a slice of reduced fat cheddar cheese, served on a toasted English muffin.
Healthier version of traditional breakfast items have gained in popularity as customers look for slightly-better-for-you alternatives to their fast food staples. Dunkin' has a full line up of better-for-you options that they call their DDSmart menu. Items on the menu meet at least one of the following criteria: 25% fewer calories, 25% less sugar, saturated fat, or sodium than comparable items, and/or contain an ingredient or nutrient that is nutritionally beneficial (commonly whole grains or fiber).
You've probably seen similar moves from competing chains like McDonald's, who, this month, introduced the an egg white option for their breakfast sandwiches, or from Chick-fil-A, who bolstered their salad line up recently.
Of course, whether such moves pan out ultimately rests on whether or not people end up actually ordering them.