Fudge Fridge Cake

225g Butter
1 Egg, Beaten
450g Icing Sugar
2t Cocoa
1t Vanilla
1 Pkt Crushed Marie Biscuits

Melt butter.
Remove from heat and stir in egg.
Add icing sugar, cocoa vanilla and biscuits.
Mix well.
Spread on tin lined with greaseproof paper.
Put in refrigerator to set.
Cut into squares.