Preheat the oven to 350°F.
In a microwave safe bowl, melt 1/2 cup of chocolate chips and coconut oil in 30 second intervals, mixing until smooth. Allow to cool slightly.
In a small bowl, disolve the instatnt coffee in the hot water. Set aside.
In a medium bowl, mix together the flour, baking soda and salt.
In the bowl of a stand mixer, cream together the butter, sugar and coffee until light and fluffy. Beat in the egg and melted chocolate. Slowly add in the flour mixture until fully incorporated. Fold in the remaining chocolate chips and cashews.
Scoop the dough with a cookie scoop onto an ungreased cookie sheet and bake in the preheated oven for 10-12 minutes. Allow to cool for around 2 minutes on the cookie sheet before transfering to wire racks to cool completely.