Preheat the oven to 215°C and line a baking sheet with a piece of parchment paper or a silpat mat.
In a large mixing bowl, combine the flour, sugar, baking powder, baking soda, salt and cold butter then use your hands to cut in the butter until the butter appears to disappear and a sandy mixture has formed.
Add the cold sour cream and use a spoon to mix (it's okay if it's not quite solid at this point).
Turn the dough out on to a floured surface and work together until it forms a large rectangle. Fold the rectangle over itself into the shape of a letter a few times making several layers, then push back into the shape of rectangle and cut even sized pieces of dough with a knife.
Place the biscuits on the baking sheet and bake for 18-20 minutes until golden brown.
8 servings
1 biscuit