01 - 
                Preheat your oven to 350°F (175°C) and line two baking trays with parchment paper.
              
              
              
                02 - 
                In a large bowl, cream together the softened butter and brown sugar until light and fluffy. Beat in the egg and vanilla extract until fully combined.
              
              
              
                03 - 
                In another bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt.
              
              
              
                04 - 
                Gradually mix the dry ingredients into the butter mixture until just combined.
              
              
              
                05 - 
                Fold in the Reese’s Pieces candies.
              
              
              
                06 - 
                Scoop the dough into ¼ cup-sized balls and place extra Reese’s Pieces on top of each.
              
              
              
                07 - 
                Arrange the dough balls on the prepared baking trays, leaving about 2 inches between each.
              
              
              
                08 - 
                Bake for 10-12 minutes. Let the cookies cool on the baking trays for 5 minutes before transferring them to a wire rack to cool completely.