01 -
Preheat oven to 350°F (175°C).
02 -
Line a 12-cup muffin tin with cupcake liners.
03 -
In a medium bowl, whisk together flour, cocoa powder, baking powder, baking soda, and salt until evenly combined.
04 -
In a large bowl, whisk sugar and eggs until pale and fluffy.
05 -
Stir sour cream and vegetable oil into the egg mixture until thoroughly blended.
06 -
Gradually add dry ingredients to the wet mixture, stirring gently until just incorporated.
07 -
Delicately fold in blackberries and dark chocolate chips.
08 -
Divide batter evenly, filling each cupcake liner approximately two-thirds full.
09 -
Bake for 18–20 minutes, or until a toothpick inserted into the center emerges clean.
10 -
Allow cupcakes to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.
11 -
In a small bowl, combine powdered sugar with a few drops of water to achieve a pourable glaze, then drizzle over cooled cupcakes.
12 -
Top each cupcake with extra fresh blackberries before serving.