Preheat your oven to 375°
Line a large baking sheet with parchment paper and set aside for now
In a large bowl, use an electric hand mixer to cream 1/2 cup of room temperature salted butter with 1/2 cup of granulated sugar and 1/3 cup of brown sugar until creamy
Add 1 large egg and 1 teaspoon of pure vanilla extract and mix until well combined
Sift 1 cup of all purpose flour, 1/3 cup of natural unsweetened cocoa powder, 2 teaspoons of espresso powder (optional), 1/2 teaspoon of baking soda and 1/2 teaspoon of salt into the bowl and mix until just combined
Add most of the chocolate chips or chunks and roughly chopped cashews and mix until evenly distributed
Drop evenly sized portions onto the parchment lined baking sheet leaving about 2 inches between
Press the remaining chocolate and cashews into the tops of the cookie dough
Bake in a 375° oven for 10-11 minutes or until the edges are set
Allow the cookies to cool on the baking sheet until they are firm enough to transfer onto a cooling rack
Store leftovers in an airtight container at room temperature for up to 4 days