Preheat oven to 420 degrees. Line a baking sheet with parchment paper or silicon pad - I like to use a silicon pad.
In food processor, mix together flour, baking powder, baking soda, salt and 2 tbsp of sugar. Pulse to mix.
Place butter in food processor and pulse until mixture resembles coarse meal.
Combine the egg and the buttermilk together.
Pour egg buttermilk mixture in and pulse until ball forms.
Add currants and pulse.
Transfer dough to lightly floured work surface. Knead dough 5-6 times or until mixture comes together. Roll and cut into desired sizes.
Transfer to baking sheet.