Combine chopped butter, condensed milk, sugar, sifted cocoa powder and vanilla extract in a large saucepan.

Stir or low heat until smooth. Do not stop stiring until smooth.

Remove from the heat and add the biscuit crumbs. Stir to combine.

Using damo hands, roll three heaped teaspoons of mixture around each marshmallow. (I advise to cut the marshmallows in half as the balls will be very large)

Press firmly around each marshmallow to enclose marshmallow.

Place coocnut in a small bowl and coat balls after enclosing the balls.

Place on plates in the fridge with cling wrap.

Enjoy once firm :)