Easy Biscuit Cake for Holidays

----------Ingredients of chocolate biscuit cake----------
For Dough
- 250g [9oz] Biscuits
- 30g [1oz] Cocoa Powder
- 30ml [1 fl oz] Melted Butter
- 130ml [4 fl oz] Milk

For Cream
- ¼ Cup Milk
- ¼ Cup Sugar
- ⅓ Cup Whipping Powder

For Garnish
Black Olive