Preheat oven to 180°C/350°F.
Line your baking sheet with parchment paper.
Mix butter and brown sugar.
Then add flour, baking soda, salt. Mix only till combined. Do not overmix!
Add milk & vanilla.
Your batter is done.
Fill a disposable piping bag with the tip of your choice.
Bake in oven for 10-12 minutes.
For the filling, mix everything in a bowl. Add milk if needed, to get a smooth yet thick batter.
It should look something like this.
To assemble, take cooled cookie and spread filling. How much you want is up to you. :)
For the filling, you could add a little ginger or lemon or orange flavoring. I like mine with ginger. :)
Sandwich with another cookie.
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