Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper and set aside.
In a large bowl, cream the softened butter and granulated sugar together until smooth and slightly fluffy.
Add the egg, vanilla extract, and coffee extract to the butter-sugar mixture and beat until well combined and light in color, scraping the bowl as needed.
Sift or add the all-purpose flour, unsweetened cocoa powder, baking soda, and salt to the wet ingredients; stir until just combined without overmixing.
Fold in the mini chocolate chips until evenly distributed in the dough.
Scoop rounded tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 8 minutes, until the edges are set but the centers are still soft.
Let the cookies cool on the hot baking sheet for 5–10 minutes to finish baking, then transfer to a wire rack to cool completely.