Heat the oven to 180°C / 350°F fan.
In a mixing bowl, beat together eggs, sugar, salt, vanilla, milk and melted butter to a unify batter.
Sift in the flour and baking powder. Mix until unified again.
Pour the batter into the cupcake paper cases up to ¾ height - the cakes will grow in the oven.
Bake for 20 minutes until golden.
Cool the cupcakes at room temperature.
With a teaspoon, create holes in each cupcake center.
Fill the holes with the filling.
Make the cream: whip all frosting ingredients together to a unify cream with stiff peaks.
Pipe the cream on top of the filled cupcakes with a star nozzle or any other nozzle that you choose.
Garnish each cupcake with fresh blackberry on top.