Cadbury Creme Egg Coffee is exactly what it sounds like: coffee sweetened with a Cadbury Creme Egg. All you need to do is dissolve a whole, large egg into a hot mug of freshly brewed coffee. The egg adds a nice sweetness and a hint of chocolate without much effort at all. I prefer using the Cadbury Caramel Eggs, which add a subtler sweetness and give the coffee a caramel-latte feel. You don’t need to add milk or cream to the coffee after adding the egg, although a little bit of whipped cream makes the coffee look quite festive if you plan to serve this around Easter.
source: http://breweddaily.com/2011/04/cadbury-creme-egg-coffee/