Step 1

Preheat oven to 350 degrees, and grease two 12 cup muffin trays, for a total of 24 cupcakes.

Step 2

Sift together the dry ingredients; flour, sugar, cocoa, baking soda, baking powder, and salt, in the bowl of a stand mixer, fitted with the paddle attachment. Stir together until well blended, about 1 minute, on LOW speed.

Step 3

In another bowl, combine the buttermilk, oil, eggs, and vanilla. With the mixer on low speed, slowly add the wet to the dry ingredients, Continue to run at low speed until well combined, scraping the bottom of the bowl as needed.

Step 4

Continuing on low speed, slowly pour in the hot coffee, and mix until smooth in consistency. The batter will be VERY runny, compared to most cake batters. Pour the mixture into a glass measuring cup to more easily pour into the muffin tins, filling about 3/4 of the way up. This should fit exactly into 24 cups.

Step 5

Bake at 350 for 25 minutes, then allow to cool in the pans for 30 minutes. This will ensure even settling, and a better release from the pans. Continue to cool on a baking rack as needed. Set aside until ready to frost. .

Step 6

Chop the chocolate and place in a glass bowl over a pot of simmering water, stirring slowly until just barely melted. Remove from the heat, stirring until all pieces are smoothly combined, then set aside to cool.

Step 7

In the bowl of an electric mixer fitted with the whisk attachment, beat the butter on medium-high speed until yellow and fluffy, about 3 minutes. Add the egg yolks and vanilla, continuing to beat for another 3 minutes. Reduce the mixer to low speed, then slowly add the confectioner's sugar, and continue to mix for another minute or so once combined, scraping down the bowl as needed. Last, add 2 tsp of the hottest tap water to the instant espresso powder, then stir into the frosting.

Step 8

Frost the cupcakes! I like to use a large zip top bag, snipping a small opening in one corner to pipe the frosting on. You can also just spread it - the frosting is so delicious it doesn't matter what it looks like!!