Make the cupcake batter per the box of white cake mix except substitute the strong coffee for the water.
Using an ice cream scoop fill the cupcake tins that have been lined with cupcake papers.
Bake the coffee cupcakes per the instructions on the cake mix package.
Cool the cupcakes on a rack and make the frosting.
To make the frosting
Place the Marscapone and powdered sugar in a mixing bowl. Using the electric mixer, blend until creamy.
Add the heavy cream and continue to mix until the frosting gets fluffy and starts to hold its shape. This will take a couple of minutes.
Frost the cupcakes. Sprinkle a little bit of cocoa powder over the tops of the frosted cupcakes.
Store these Tiramisu Cupcakes with Mascarpone Frosting in the refrigerator.
Notes
*the amount of eggs, oil, and liquid listed above are per the directions on my box of cake mix. Follow the ingredient amounts on your box of cake mix. If you don't have a cup of leftover strong coffee from the morning, try this instead. Use instant coffee and dissolve it in a small amount of water. I usually use 2-3 heaping teaspoons of coffee granules. Then, add more water to equal the amount of liquid as needed per the box of cake mix.