01 -
Preheat oven to 175°C. Line a muffin tray with 12 paper cupcake liners.
02 -
In a large mixing bowl, beat softened butter and granulated sugar until light and fluffy.
03 -
Add eggs one at a time, mixing thoroughly after each. Stir in vanilla extract and milk until the mixture is smooth.
04 -
In a separate bowl, whisk together all-purpose flour, baking powder, and salt. Gently fold the dry mixture into the wet ingredients until just combined. Do not overmix.
05 -
Puree fresh blackberries until smooth. Gently swirl the blackberry puree into the cupcake batter, taking care not to fully incorporate—distinct streaks should remain.
06 -
Divide the swirled batter evenly among the liners, filling each two-thirds full.
07 -
Bake cupcakes for 20–25 minutes, or until a toothpick inserted into the center emerges clean.
08 -
Allow cupcakes to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving.