Out of curiosity I looked at the calories in a typical Easter Egg. If you don't know, are you ever going to be surprised!
For instance, a Cadbury's Wispa HALF egg contains 520 kcals. So with the 3 Wipsas that come with it, it's a colosal total of 1,620 kcals!
Galaxy Minstrels is roughly the same total, but Mars are quite coy about admitting just how bad they are for you and print the calories "per 40g portion": the egg is 119g and the 2 bags of Minstrels inside are 115g each - so around the box contains around 1,900 kcals!
DON'T DO IT!
To put this in perspective, you could have THREE *EXTRA* EVENING MEALS for the same calories!