All too often, I open the carton of eggs in my fridge only to find just one left. One egg! What can you do with just one egg? Well, while you might not be able to make an omelet, there’s actually a whole lot you can make with a solo egg. From breakfast for one and deep-dish chocolate chip cookies, to easy muffins and spaghetti with meatballs, here are 10 ways to use that remaining egg up.