Before getting started, preheat your oven to 350ºF, and line your cupcake tin with cupcake liners.
Add the flour, sugar, cocoa powder, cornstarch, baking powder and baking soda to a large mixing bowl, whisking 'til thoroughly mixed together.
Make a well in the center of the dry ingredients. Add all of the wet ingredients, whisking everything together 'til well combined.
Add about 1/4 cup of the cupcake batter to each liner in the cupcake tin. This recipe should make 11 big cupcakes plus 1 small cupcake by the time all liners are filled.
Bake at 350ºF for 20-23 minutes, or 'til a toothpick inserted into the center comes out clean. Let cool completely before decorating.
Start by crumbling the smaller cupcake into a small bowl.
In the bowl of an electric stand mixer or by using an electric hand mixer, beat the cream cheese frosting to make it lighter and fluffier for piping onto the cupcakes.
Pipe your cream cheese frosting onto the cupcakes as desired, and then sprinkle the cupcake crumbs on top.
Serve and enjoy!