Preheat the oven to 425°F, 220°C, or gas mark 7 with the cast iron skillet inside.
In a food processor or blender add the eggs, milk, flour, vanilla, salt, cocoa powder, espresso powder, and sugar and blend until batter is evenly smooth.
Once the oven is hot remove the cast iron skillet and add the butter. Make sure all of the butter has melted. Immediately pour the batter into the skillet and place back into the oven to bake for 15 minutes or until the sides have started turning dark brown.
Making the Espresso Whipped Cream
In the bowl of a stand mixer fitted with the whisk attachment whisk the heavy cream on high until soft peaks start to form. Add the powdered sugar and espresso powder and whisk until stiff peaks form.
Assemble the Dutch Baby
Once the Dutch baby is out of the oven immediately top with the raspberries and espresso whipped cream. Serve with additional maple syrup and powdered sugar.