Microwave Mars Bar Slice

Directions
Preparation:10min  ›  Cook:4min  ›  Extra time:20min chilling  ›  Ready in:34min 

1. Line a 23x23cm square cake tin with plastic wrap
2. Cut the mars bars roughly and place into a large microwave safe bowl.
3. Add the butter and marshmallows.
4. Melt in the microwave; this should take about 4 minutes in total but check and stir after every minute as each microwave is a little different.
5. When it is all melted add in the rice cereal all at once and stir very quickly.
6. Pour into the prepared cake tin; it will be a large blob.
7. Using a metal spoon smooth out; this happens very easily.
8. Refrigerate for 20 minutes or so.
9. Slice into squares only when cold.