Preheat oven to 350℉ (180℃)
Line cupcake pans with liners.
Combine flour, cocoa powder, sugar, cornstarch, salt, baking powder and baking soda in the bowl of a stand mixer. If mixing by hand or with a hand mixer, combine ingredients in a large mixing bowl.
¾ Cup Cocoa Powder, 2 Cups All Purpose Flour, 2 Cups Granulated Sugar, 2 Tablespoons Corn Starch, 1 teaspoon Salt, 2 teaspoons Baking Powder, ½ teaspoon Baking Soda
Add oil and eggs. Mix until combined.
¾ Cup Vegetable or Canola Oil, 4 Large Eggs
Slowly pour brewed coffee into bowl while continuing to mix, scraping the bowl occasionally. The batter should be smooth.
1 ¼ Cup Brewed Coffee
Scoop batter into the cupcake liners until ⅔ full.
Bake for 22 - 25 minutes, or until cupcakes are fully risen and a toothpick inserted in the center of the cupcakes comes out clean.
Place cupcakes on a rack and allow to cool completely before filling and icing.