Preheat oven to 350 degrees

Add butter to mixer and beat until smooth. Add powdered sugar and beat until incorporated. Mix in vanilla

Mix together flour, salt, and coffee grounds

Gently add dry ingredients to mixer and beat until combined. The mixture is incorporated when your bowl looks like a pile of lumpy sand.

Using your hands, knead together mixture, until a ball of dough forms. This may take longer than you like, but keep the faith and keep kneading.

Once the dough is beginning to form, roll it into a log, and wrap in plastic wrap.

Place wrapped log in fridge, allow to chill for at least one hour

Once chilled, remove log from fridge, unwrap, and slice log into half inch cookies

Place cookies on a silicon baking mat lined sheet, bake at 350 for 10 minutes, or until edges are brown

Remove from oven, allow to cool on baking rack.

Once cool, dip in glaze or chocolate or serve as-is.