In a stand mixer add soften butter and icing sugar, whisk until pale and fluffy, about for 2-3 mins.
Add in condensed milk and continue whisking 1 min.
Add in flour, almond flour gently fold until just combined (do not over mix the mixture).
Fill dough into the piping bag and pipe on baking sheet.
Transfer piped cookies to the freezer and let chill for 30mins.
Bake chilled cookies in 155c Preheated oven for 20 mins.
Allow cookies to cool completely.
Decorate with chocolate, enjoy!
