Preheat the oven to 350F degrees. Line a 12-cup muffin pan with cupcake liners. Line a second pan with 2 liners - this recipe makes about 14 cupcakes. Set aside.

Make the cupcakes: In a large bowl, whisk the cocoa powder, flour, baking soda, baking powder, and salt together until thoroughly combined. Set aside. In a medium bowl, whisk the eggs, sugar, brown sugar, oil, and vanilla together until completely smooth. Pour half of the wet ingredients into the dry ingredients. Then half of the buttermilk. Gently stir - about 5 stirs. Repeat with the remaining wet ingredients and buttermilk. Stir until just combined; do not overmix. The batter won't be very...

Pour/spoon the batter into the liners - fill only halfway to avoid spilling over the sides. Bake in batches for 18-19 minutes, or until a toothpick inserted in the center comes out clean. Allow to cool completely before frosting. Mini cupcakes will take about 10 minutes, same oven temperature.

For the Icing:

Prepare the icing  as per packet instructions along with butter, add in essence to your flavour of liking

Once the cupcakes are out of the oven and cool, pipe the icing over it as per your own choice of design.