Mousse cake

INGREDIENTS:base of cookie, cream mass, butter, milk.
PREPARATION OF BASE OF THE CAKE:Heat to melt 40 g. of butter in a bowl but don't boil. Remove from heat and add the contents of the bag with the base mixture. Cover bottom of pan, previously rinsed and dry, and with the help of a spoon spread and press very firmly so that it is evenly distributed. Leave in the fridge or freezer while preparing the mousse.
PREPARATION OF THE CREAM MOUSSE: Dissolve the contents of the bag metalized in 250 ml. of cold milk. Beating media.alta speed for 2 minutes . Expanding on the base already prepared and smooth evenly with a spatula or spoon . Leave in the fridge or freezer 1 hour.