Preheat the oven to 350°F and prepare a muffin tin with liners.
In a large bowl, combine the dry chocolate cake mix, dry fudge brownie mix, eggs, water, and vegetable oil. Whisk for 2 minutes, or until lumps are mostly gone.
Pour the batter into the prepared muffin tin, filling each cup about ⅔ full. Bake for 18-22 minutes*.
When done baking, remove cupcakes and allow to cool in the muffin tin for up to five minutes. Carefully place cupcakes on a cooling rack and cool for 30 more minutes.
Frosting
In the bowl of a stand mixer with the whisk attachment (a hand mixer works excellently here as well), combine room temperature butter, cocoa, honey, vanilla, and confectioners' sugar.
Turn mixer on low and let it combine the ingredients for about 30 seconds.
Slowly add the cream, a little at a time, until you reach your desired consistency. You may not need all of the cream, or you may need a little more. It can vary from season to season and kitchen to kitchen.
Spread the frosting over the cooled cupcakes and serve.
Notes
*It is important to not overbake these cupcakes. Insert a toothpick at 18 minutes and if it is removed with crumbs but no wet batter, they are done. A few crumbs on the toothpick is good.