Creating Chocolate Tiramisu Cupcakes is simple if you follow these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a muffin tin with cupcake liners.
2. Mix Dry Ingredients: In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt.
3. Combine Wet Ingredients: In another bowl, mix the egg, milk, vegetable oil, and vanilla extract until well combined.
4. Add Coffee: Stir in the hot brewed coffee to the wet mixture.
5. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, mixing until just combined. Be careful not to overmix.
6. Fill Cupcake Liners: Pour the batter into the prepared cupcake liners, filling each about two-thirds full.
7. Bake: Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted in the center comes out clean.
8. Cool the Cupcakes: Remove from the oven and let the cupcakes cool in the pan for 10 minutes. Then transfer to a wire rack to cool completely.
9. Make the Frosting: In a mixing bowl, combine the mascarpone cheese, heavy cream, powdered sugar, and vanilla extract. Whip until soft peaks form.
10. Frost the Cupcakes: Once the cupcakes are completely cooled, pipe or spread the mascarpone frosting on top.
11. Dust with Cocoa: Finish by dusting each cupcake with cocoa powder for an elegant touch.

These steps will guide you in creating these incredible cupcakes with ease!