Pre heat oven to 170° then grease & line a square tin, mine was 8 & half by 8 & half

Melt margarine with chocolate

While chocolate is melting put caster sugar, self raising flour & cocoa in a mixing bowl, mix it then set aside

Lightly whisk eggs with electric whisk then stir in peppermint essence

When chocolate & butter has melted stir in the egg mix then add to dry ingredients & mix well,

Put mint thins in bowl & crush with the back of a spoon,

Pour half the brownie mix in the tin then sprinkle the crushed mint thins on top covering as much as you can

Pour the rest of the brownie mix on top then pop in the oven for 20+ minutes, mine took 20, when skewer comes out clean take out the oven and leave to cool completely then take out & cut up,

Enjoy on its own or with ice cream, I like to put mine in microwave for a few seconds and let ice cream melt a bit over it,,