Preheat your oven to 350°F (175°C) and line your baking sheets with parchment paper.

In a large mixing bowl, cream together the softened unsalted butter, granulated sugar, and brown sugar until light and fluffy.

Mix in the eggs one at a time until fully incorporated.

In a separate bowl, whisk together the all-purpose flour, baking soda, instant coffee powder, and cocoa powder, then gradually add to the wet mixture.

Divide the dough into two portions, and mix additional cocoa powder into one half for the marble effect.

Alternately scoop the two doughs onto the baking sheets to create a marbled pattern.

Bake for 10–12 minutes until the edges are golden and centers are soft. Let cool before transferring to a wire rack.