01 - 
                Heat butter on low until melted—use the microwave or a small pan. Keep it from bubbling so you don't lose liquid. Pour it into a mixing bowl and stick it in the fridge for 20 mins to cool down to room temp.
              
              
              
                02 - 
                Toss the granulated and brown sugars into the cooled butter. Stir together using a spatula or set a stand mixer to medium speed for roughly a minute.
              
              
              
                03 - 
                Stir the egg and vanilla into the sugar-butter blend until it's all mixed up.
              
              
              
                04 - 
                Whisk flour, baking powder, espresso powder, baking soda, and salt in a separate bowl. Slowly mix the dry stuff into the wet batter, stirring just enough to combine everything.
              
              
              
                05 - 
                Scoop out 11 portions with a 2-tbsp cookie scoop. Roll 'em into balls, line them up on a tray with baking paper, and pop them in the fridge for 1 hour.
              
              
              
                06 - 
                Get your oven ready to go by setting it to 180ºC (355ºF) and lining a baking sheet with baking paper.
              
              
              
                07 - 
                Put six cookies on a baking sheet and bake only one tray at a time for 10–11 mins. Let the cookies cool for 3 mins on the tray before transferring to a rack.
              
              
              
                08 - 
                Whisk the mascarpone, vanilla, confectioners sugar, honey (or agave), and heavy cream with a mixer until stiff peaks hold. Pop it in the fridge if you're making it early.
              
              
              
                09 - 
                Spoon the mascarpone cream into a piping bag with a round Wilton 2A tip. Pipe swirls of cream on the cooled cookies, and give them a cocoa powder sprinkle before serving.