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Each spring Cadbury candy machines whip out 66,000 of these cool candies every hour. And now, because of the success of these chocolates with the orange, yolk-colored center, other candy companies have come out with their own milk chocolate eggs. Some are filled with Snickers or Milky Way centers, while others contain peanut butter, coconut, caramel, or the same type of fondant center as the original—right down to the colors. Still, nothing compares to these original eggs that are sold only once a year, for the Easter holiday. And now you can enjoy your own version at home anytime you like. The final shape of your clones will be more like half eggs, but the flavor will be full-on Cadbury.
Source: Even More Top Secret Recipes by Todd Wilbur.
Update 4/11/17: I recently discovered that freezing the very sticky fondant center—rather than refrigerating it—makes it easier to work with. I made the adjustments in the recipe below.