In a mixer, cream together butter and sugar.
In a small bowl, combine eggs, vanilla, and coffee until fully incorporated.
In separate bowl add together flour, baking powder, cinnamon, and salt.
Slowly add your egg mixture to the butter mixture until well combined. Slowly add flour mixture until fully combined, do not over beat.
I would chill this dough for AT LEAST one hour, preferably overnight.
When you are ready to bake, preheat oven to 375 degrees and bake for 8-10 minutes, or until edges are slightly golden. Allow cookies to cool completely before covering in any icing.