Cream together caster sugar, brown sugar and 125g butter, then add egg and vanilla and mix.
Add the flour, baking soda, salt and chocolate chunks to the mixture
Mix well on low speed until a cookie dough forms.
Scoop a rounded tablespoon size dollop on to a greased baking sheet and bake for 11 minutes at 170c
Once the cookies are baked and cool, slice in half
Mix together the 25g of butter soften, icing sugar, red food colouring and milk until a cream frosting. Spread the frosting over top and bottom half of the cookie
Line the edge with mini marshmallows
Place the other frosted half over the marshmallows and viola! Halloween teeth on the go!