Preheat oven to 350 degrees and line two baking sheets with parchment paper. Melt chocolate and butter in a medium saucepan on low heat, stirring constantly until the chocolate is ¾ of the way melted. Remove from heat and let the mixture sit as the chocolate continues to melt. Stir occasionally until smooth, then set aside.

In a stand mixing bowl, beat the eggs, sugar, vanilla, baking powder and salt on high speed 5-6 minutes, until the batter is thick, creamy and completely smooth. The dough will be the consistency of brownie batter. Then reduce speed to low and mix in the melted chocolate and coffee until thoroughly combined.

Fold in flour and cocoa powder just until incorporated, then add the walnuts. Cover the dough and refrigerate for 30 minutes.

Remove dough from the fridge and form cookies by dropping 2 tablespoons of dough onto the parchment paper about 2 inches apart. (Using a small ice cream scoop really helps with this job!)

Bake cookies 12-14 minutes, rotating baking sheets halfway through the bake time. The cookies are done when the center is set but not firm—don’t over-bake them! Remove from the oven, slide the parchment onto a wire rack and allow them to cool. As the cookies cool, they’ll begin to crack and get chewy-ooey delicious!