Want Real Eggs at McDonald's? Just Ask! | Serious Eats:
"Well here's the deal: you can get your McDonald's biscuit sandwiches (or any breakfast sandwich, for that matter) made with a 100% real egg, cracked and cooked fresh on-premises. All you've got to do is tell the cashier that you'd like your sandwich made with a "round egg" and they'll replace your folded egg patty with a real egg, free of charge."