Preheat the oven to 350°F (175°C) and line a muffin tin with cupcake liners.
In a bowl, whisk together flour, cocoa powder, baking soda, and salt. Set aside.
In a large bowl, beat butter and sugar until light and fluffy. Add the egg and vanilla extract, mixing until smooth.
Slowly mix in buttermilk and vinegar.
Gradually add the dry ingredients, mixing until just combined. Stir in the green food coloring.
Divide the batter evenly among the cupcake liners. Bake for 18-20 minutes or until a toothpick inserted in the center comes out clean. Let cool completely.
Beat cream cheese and butter until smooth. Gradually add powdered sugar and vanilla, beating until fluffy.
Pipe or spread frosting onto the cooled cupcakes. Decorate with sprinkles or edible gold dust for a festive touch!
Keyword baking recipes, Christmas dessert, cupcake recipe, homemade dessert, St. Patrick's Day recipes