You could eat these like popcorn.
1 1/2 cups unsalted butter, softened
1 cup sugar
1 teaspoon vanilla
3 1/2 cups flour
2/3 cups cocoa powder
2 tablespoons espresso powder
1/4 teaspoon salt
Preheat oven to 350 degrees F.
Beat together butter and sugar in a large mixing bowl with an electric mixer on medium speed until well combined. Beat in vanilla.
In separate small mixing bowl, stir together flour, espresso powder, cocoa powder and salt until combined then beat into butter/sugar mixture.
Form dough into three logs and wrap in plastic wrap. Refrigerate for an hour. Preheat oven to 350 degrees F.
Slice in 1/4 pieces and place cookies on ungreased baking sheets and bake about 15-20 minutes (or bake about 20-25 minutes or cookies about 2-3 inches in diameter).