Preheat your oven to 375 degrees. Prepare a muffin pan with nonstick. Use a whisk or a fork to blend together the almond flour, whey protein, instant espresso, baking powder, baking soda, and salt. Set this bowl aside .
Beat together the butter, golden sweetener, and granulated sweetener until creamy (about five to six minutes) Then add the eggs, vanilla, and Greek Yogurt and mix until combined. Next, add the dry ingredients from the first bowl to the mixing bowl and mixed until just combined. Then use a scoop or large spoon to evenly transfer the batter to the prepped pan, filling each well about ¾ full. Bake for 18 to 20 minutes or until the edges are golden and a toothpick inserted in the center returns clean. Then allow the cupcakes to fully cool before removing. When fully cool, slice the tops off the muffins to create a flat top but reserve the cut off pieces for the final topping.
Make the coffee soak by stirring together the hot water and instant espresso In a mixing bowl, beat together the mascarpone cheese, erythritol sweetener, vanilla, and 2 tablespoons of the coffee soak that you just made. Next, in a separate bowl, beat the heavy cream until soft peaks form. Then, fold the peaked heavy cream into the mascarpone mixture from the last step.
Lastly, make the jars. Start by placing one cake into each of six jars. Then layer the cakes with a tablespoon of the soak. For the next layer, spoon some of the mascarpone cream. Top with an additional cake and then another scoop of the mascarpone cream. For the topping, stir together the remaining crumbled cake tops with the cocoa powder. Sprinkle this over the tops of the jars. Refrigerate overnight.