01 -
Set the oven temperature to 175°C (350°F) and line a 12-slot cupcake pan with paper liners.
02 -
In a medium bowl, combine baking soda, salt, flour, and cocoa powder. Set aside.
03 -
In a large bowl, mix melted butter and brown sugar until smooth. Add eggs one at a time, blending thoroughly after each. Stir in vanilla, buttermilk, and mashed blackberries until combined.
04 -
Gradually incorporate the dry mixture into the wet mixture. Gently fold until just combined without overmixing.
05 -
Divide batter evenly among prepared cupcake liners. Bake for 20 to 22 minutes or until a toothpick inserted in the center comes out clean.
06 -
Allow cupcakes to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before frosting.
07 -
In a bowl, beat softened butter and vanilla until creamy. Gradually mix in powdered sugar, followed by the strained blackberry purée. Adjust the consistency with heavy cream as needed.
08 -
Frost the cooled cupcakes and garnish with fresh blackberries, shaved chocolate, or edible flowers as desired.