Beat butter and sugar together in large mixing bowl.
In a separate small bowl, combine eggs, vanilla, and coffee mix fully
In another bowl add all dry items together.
Slowly add the egg mixture to the butter mixture. Mix well.
Slowly add in flour mixture and stir fully combined, do not over mix.
Place the dough in your refrigerator for 1-2 hours.
Then, preheat oven to 350 degrees
Roll out the dough on a floured solid surface to about 1/2 inch thick. Using a circle cookie cutter, punch out circles and place on a parchment lined baking sheet
Bake for 8-10 minutes, or until edges are slightly golden
Allow cookies to cool completely before filling with the icing
Icing
Melt the butter in a small saucepan on low heat.
Add brown sugar and heavy cream.
Stir the mix constantly over medium heat until sugar is dissolved.
Add salt and cook for 2 minutes.
Remove from heat and allow to cool (1 hour minimum).
Beat in powdered sugar 1 cup at a time, until you reach desired consistency.