Then cook like this

1. Place mars bar pieces and butter into a microwave safe bowl. Melts on a medium heat for 1 minute.
2. Stir to combine the mixture.
3. Add the puffed rice cereal to the bowl and mix to coat well.
4. Using a medium sized egg mould (you will need 12 holes total), place a tablespoon of mixture into the mould and work it up the sides to form a basket like shape. Repeat for the whole mixture.
5. Place moulds into the fridge and allow to set for 2 hours.
6. Remove moulds from the fridge and using a butter knife, carefully remove each shell from the egg moulds.
7. Place some small chocolates in one half of the shell. You can pile these up slightly. This forms your “glue”.
8. Spoon or pipe a little of the melted chocolate around the rim of the shell.
9. Place another empty shell on top of this and press together gently to form an egg shape. Your warm hands will help soften it slightly and shape.
10. Place into an empty egg mould and repeat for the remaining shells.
11. Place into the fridge to allow the chocolate glue to set completely.
12. Serve.