2cupsunsalted butter, softened at room temperature
1/4cupKahlua liquor, or strong espresso
3-4tablespoonsheavy cream
3cupsconfectioner's sugar
1tspinstant coffee
1/8teaspoonsalt
Instructions
Preheat the oven to 350F. Line a 24-tin cupcake pan with liners; I used my 12-cup pan twice since I only have one 12-cup pan.
I recommend mixing the ingredients by hand to avoid over-mixing, which will lead to a dome-shaped cupcake. In a large bowl, whisk together the sugar, butter, eggs and vanilla. In a separate bowl, combine together the flour, baking powder and salt. Measure out the buttermilk, then add the instant coffee; stir to dissolve completely.
Add the flour using a fine-mesh strainer and alternate with the buttermilk, until you have a smooth cake batter. Fill the cupcake liners three-quarters of the way full. Bake in preheated oven for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Remove the cupcakes from the pan and cool on a wire rack.
Meanwhile, prepare the buttercream. Mix the softened butter in a mixer bowl until light and fluffy, about 5 to 7 minutes. Add the Kahlua, instant coffee and heavy cream, then begin adding the confectioner's sugar, 1/2 cup at a time. Make sure to scrap down the sides of the mixer bowl often. Add the salt and mix for another 5 minutes to get a very fluffy butter cream. Transfer frosting into a pastry bag. Once cupcakes are completely cooled, frost with butter cream.
Store cupcakes in air-tight container in the refrigerator if not serving right away. Remove from refrigerator 1 hour before serving.
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