01 -
In a mixing bowl, whisk together the flour, cocoa powder, baking powder, baking soda, and salt.
02 -
In a separate bowl, beat the eggs, sugar, oil, and vanilla until fully combined. Mix in the buttermilk slowly.
03 -
Gradually mix the dry ingredients into the wet ingredients until the batter is smooth and free of lumps.
04 -
Preheat the oven to 350°F (175°C). Line a cupcake tin with liners and fill each 3/4 full with batter. Bake for 18-20 minutes or until a toothpick comes out clean.
05 -
With an electric mixer, beat the softened butter until creamy. Gradually add the powdered sugar, then mix in the blackberry puree, vanilla extract, and a pinch of salt. Continue mixing until the frosting is fluffy.
06 -
Once the cupcakes have completely cooled, use a piping bag to frost the tops with the blackberry buttercream.